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31140224 = 272111153
BaseRepresentation
bin111011011001…
…0100110000000
32011121002100122
41312302212000
530432441344
63031235412
7525454553
oct166624600
964532318
1031140224
111663a125
12a518b68
1365b3c8b
1441c869a
152b01aee
hex1db2980

31140224 has 32 divisors (see below), whose sum is σ = 62385240. Its totient is φ = 15482880.

The previous prime is 31140191. The next prime is 31140233. The reversal of 31140224 is 42204113.

It is a tau number, because it is divible by the number of its divisors (32).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26432 + ... + 27584.

Almost surely, 231140224 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 31140224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31192620).

31140224 is an abundant number, since it is smaller than the sum of its proper divisors (31245016).

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

31140224 is a wasteful number, since it uses less digits than its factorization.

31140224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1378 (or 1366 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 31140224 is about 5580.3426418097. The cubic root of 31140224 is about 314.6110055079.

Adding to 31140224 its reverse (42204113), we get a palindrome (73344337).

The spelling of 31140224 in words is "thirty-one million, one hundred forty thousand, two hundred twenty-four".

Divisors: 1 2 4 8 16 32 64 128 211 422 844 1153 1688 2306 3376 4612 6752 9224 13504 18448 27008 36896 73792 147584 243283 486566 973132 1946264 3892528 7785056 15570112 31140224