51631680 has 56 divisors (see below), whose sum is σ = 163933632. Its totient is φ = 13768192.

The previous prime is 51631663. The next prime is 51631747. The reversal of 51631680 is 8613615.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25932 + ... + 27851.

Almost surely, 2^51631680 is an apocalyptic number.

It is an amenable number.

51631680 is an abundant number, since it is smaller than the sum of its proper divisors (112301952).

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

51631680 is a wasteful number, since it uses less digits than its factorization.

51631680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53803 (or 53793 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 51631680 is about 7185.5187704160. The cubic root of 51631680 is about 372.3677713340.

The spelling of 51631680 in words is "fifty-one million, six hundred thirty-one thousand, six hundred eighty".