51664804 has 12 divisors (see below), whose sum is σ = 91896028. Its totient is φ = 25408800.

The previous prime is 51664799. The next prime is 51664813. The reversal of 51664804 is 40846615.

It can be written as a sum of positive squares in 2 ways, for example, as 22071204 + 29593600 = 4698^2 + 5440^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 51664804.

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, 105627 + ... + 106114.

Almost surely, 2^51664804 is an apocalyptic number.

It is an amenable number.

51664804 is a deficient number, since it is larger than the sum of its proper divisors (40231224).

51664804 is a wasteful number, since it uses less digits than its factorization.

51664804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211806 (or 211804 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 34.

The square root of 51664804 is about 7187.8233144673. The cubic root of 51664804 is about 372.4473844276.

The spelling of 51664804 in words is "fifty-one million, six hundred sixty-four thousand, eight hundred four".