51457764 has 12 divisors (see below), whose sum is σ = 120068144. Its totient is φ = 17152584.

The previous prime is 51457729. The next prime is 51457771. The reversal of 51457764 is 46775415.

It is a tau number, because it is divible by the number of its divisors (12).

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

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, 2144062 + ... + 2144085.

Almost surely, 2^51457764 is an apocalyptic number.

It is an amenable number.

51457764 is an abundant number, since it is smaller than the sum of its proper divisors (68610380).

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

51457764 is a wasteful number, since it uses less digits than its factorization.

51457764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4288154 (or 4288152 counting only the distinct ones).

The product of its digits is 117600, while the sum is 39.

The square root of 51457764 is about 7173.4067220533. The cubic root of 51457764 is about 371.9492068469.

The spelling of 51457764 in words is "fifty-one million, four hundred fifty-seven thousand, seven hundred sixty-four".