51290864 has 20 divisors (see below), whose sum is σ = 102582720. Its totient is φ = 24817920.

The previous prime is 51290831. The next prime is 51290891. The reversal of 51290864 is 46809215.

51290864 is an admirable number.

It is a congruent number.

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, 51209 + ... + 52200.

It is an arithmetic number, because the mean of its divisors is an integer number (5129136).

Almost surely, 2^51290864 is an apocalyptic number.

It is an amenable number.

51290864 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

51290864 is a wasteful number, since it uses less digits than its factorization.

51290864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103448 (or 103442 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 35.

The square root of 51290864 is about 7161.7640285058. The cubic root of 51290864 is about 371.5466400640.

The spelling of 51290864 in words is "fifty-one million, two hundred ninety thousand, eight hundred sixty-four".