51297920 has 32 divisors (see below), whose sum is σ = 122635620. Its totient is φ = 20518912.

The previous prime is 51297919. The next prime is 51297931. The reversal of 51297920 is 2979215.

It can be written as a sum of positive squares in 2 ways, for example, as 47004736 + 4293184 = 6856^2 + 2072^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39437 + ... + 40716.

Almost surely, 2^51297920 is an apocalyptic number.

It is an amenable number.

51297920 is an abundant number, since it is smaller than the sum of its proper divisors (71337700).

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

51297920 is an equidigital number, since it uses as much as digits as its factorization.

51297920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80172 (or 80160 counting only the distinct ones).

The product of its (nonzero) digits is 11340, while the sum is 35.

The square root of 51297920 is about 7162.2566276279. The cubic root of 51297920 is about 371.5636769700.

The spelling of 51297920 in words is "fifty-one million, two hundred ninety-seven thousand, nine hundred twenty".