51631808 has 28 divisors (see below), whose sum is σ = 103994712. Its totient is φ = 25428480.

The previous prime is 51631807. The next prime is 51631817. The reversal of 51631808 is 80813615.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is not an unprimeable number, because it can be changed into a prime (51631807) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1733 + ... + 10308.

Almost surely, 2^51631808 is an apocalyptic number.

It is an amenable number.

51631808 is an abundant number, since it is smaller than the sum of its proper divisors (52362904).

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

51631808 is a wasteful number, since it uses less digits than its factorization.

51631808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12120 (or 12110 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 32.

The square root of 51631808 is about 7185.5276772134. The cubic root of 51631808 is about 372.3680790458.

The spelling of 51631808 in words is "fifty-one million, six hundred thirty-one thousand, eight hundred eight".