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51309740 = 22517229659
BaseRepresentation
bin1100001110111…
…0110010101100
310120112210201202
43003232302230
5101113402430
65031425032
71162061036
oct303566254
9116483652
1051309740
1126a65849
1215225178
13a8265c1
146b58c56
154787d45
hex30eecac

51309740 has 48 divisors (see below), whose sum is σ = 114760800. Its totient is φ = 19203072.

The previous prime is 51309733. The next prime is 51309749. The reversal of 51309740 is 4790315.

It is not an unprimeable number, because it can be changed into a prime (51309749) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 77531 + ... + 78189.

It is an arithmetic number, because the mean of its divisors is an integer number (2390850).

Almost surely, 251309740 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 51309740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (57380400).

51309740 is an abundant number, since it is smaller than the sum of its proper divisors (63451060).

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

51309740 is a wasteful number, since it uses less digits than its factorization.

51309740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 914 (or 912 counting only the distinct ones).

The product of its (nonzero) digits is 3780, while the sum is 29.

The square root of 51309740 is about 7163.0817390283. The cubic root of 51309740 is about 371.5922131847.

The spelling of 51309740 in words is "fifty-one million, three hundred nine thousand, seven hundred forty".

Divisors: 1 2 4 5 10 17 20 34 68 85 170 229 340 458 659 916 1145 1318 2290 2636 3295 3893 4580 6590 7786 11203 13180 15572 19465 22406 38930 44812 56015 77860 112030 150911 224060 301822 603644 754555 1509110 2565487 3018220 5130974 10261948 12827435 25654870 51309740