51604164 has 36 divisors (see below), whose sum is σ = 131482624. Its totient is φ = 17064432.

The previous prime is 51604127. The next prime is 51604183. The reversal of 51604164 is 46140615.

51604164 is a `hidden beast` number, since 51 + 604 + 1 + 6 + 4 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1072 + ... + 10215.

Almost surely, 2^51604164 is an apocalyptic number.

It is an amenable number.

51604164 is an abundant number, since it is smaller than the sum of its proper divisors (79878460).

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

51604164 is a wasteful number, since it uses less digits than its factorization.

51604164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11424 (or 11419 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 51604164 is about 7183.6038309472. The cubic root of 51604164 is about 372.3016110988.

Adding to 51604164 its reverse (46140615), we get a palindrome (97744779).

The spelling of 51604164 in words is "fifty-one million, six hundred four thousand, one hundred sixty-four".