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30703240 = 2351971569
BaseRepresentation
bin111010100011…
…1111010001000
32010202212221001
41311013322020
530330000430
63014024344
7521654551
oct165077210
963685831
1030703240
1116370887
12a3480b4
1364900c9
144113328
152a673ca
hex1d47e88

30703240 has 64 divisors (see below), whose sum is σ = 73872000. Its totient is φ = 11450880.

The previous prime is 30703223. The next prime is 30703249. The reversal of 30703240 is 4230703.

30703240 = T1 + T2 + ... + T568.

30703240 is a nontrivial binomial coefficient, being equal to C(570, 3).

It is a Harshad number since it is a multiple of its sum of digits (19).

It is not an unprimeable number, because it can be changed into a prime (30703249) by changing a digit.

It is the 568-th tetrahedral number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 53676 + ... + 54244.

It is an arithmetic number, because the mean of its divisors is an integer number (1154250).

Almost surely, 230703240 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 30703240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36936000).

30703240 is an abundant number, since it is smaller than the sum of its proper divisors (43168760).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

30703240 is a wasteful number, since it uses less digits than its factorization.

30703240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 670 (or 666 counting only the distinct ones).

The product of its (nonzero) digits is 504, while the sum is 19.

The square root of 30703240 is about 5541.0504419289. The cubic root of 30703240 is about 313.1324450456.

Adding to 30703240 its reverse (4230703), we get a palindrome (34933943).

The spelling of 30703240 in words is "thirty million, seven hundred three thousand, two hundred forty".

Divisors: 1 2 4 5 8 10 19 20 38 40 71 76 95 142 152 190 284 355 380 568 569 710 760 1138 1349 1420 2276 2698 2840 2845 4552 5396 5690 6745 10792 10811 11380 13490 21622 22760 26980 40399 43244 53960 54055 80798 86488 108110 161596 201995 216220 323192 403990 432440 767581 807980 1535162 1615960 3070324 3837905 6140648 7675810 15351620 30703240