51725864 has 8 divisors (see below), whose sum is σ = 96986010. Its totient is φ = 25862928.

The previous prime is 51725851. The next prime is 51725867. The reversal of 51725864 is 46852715.

It can be written as a sum of positive squares in only one way, i.e., 27144100 + 24581764 = 5210^2 + 4958^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (51725867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3232859 + ... + 3232874.

Almost surely, 2^51725864 is an apocalyptic number.

It is an amenable number.

51725864 is a deficient number, since it is larger than the sum of its proper divisors (45260146).

51725864 is a wasteful number, since it uses less digits than its factorization.

51725864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6465739 (or 6465735 counting only the distinct ones).

The product of its digits is 67200, while the sum is 38.

The square root of 51725864 is about 7192.0695213548. The cubic root of 51725864 is about 372.5940521934.

The spelling of 51725864 in words is "fifty-one million, seven hundred twenty-five thousand, eight hundred sixty-four".