51697056 has 24 divisors (see below), whose sum is σ = 135705024. Its totient is φ = 17232320.

The previous prime is 51697049. The next prime is 51697069. The reversal of 51697056 is 65079615.

It is a tau number, because it is divible by the number of its divisors (24).

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, 269160 + ... + 269351.

It is an arithmetic number, because the mean of its divisors is an integer number (5654376).

Almost surely, 2^51697056 is an apocalyptic number.

It is an amenable number.

51697056 is an abundant number, since it is smaller than the sum of its proper divisors (84007968).

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

51697056 is a wasteful number, since it uses less digits than its factorization.

51697056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 538524 (or 538516 counting only the distinct ones).

The product of its (nonzero) digits is 56700, while the sum is 39.

The square root of 51697056 is about 7190.0664809166. The cubic root of 51697056 is about 372.5248689911.

The spelling of 51697056 in words is "fifty-one million, six hundred ninety-seven thousand, fifty-six".