51311628 has 36 divisors (see below), whose sum is σ = 136532760. Its totient is φ = 16203456.

The previous prime is 51311591. The next prime is 51311669. The reversal of 51311628 is 82611315.

51311628 is a `hidden beast` number, since 5 + 1 + 31 + 1 + 628 = 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, 36825 + ... + 38192.

Almost surely, 2^51311628 is an apocalyptic number.

It is an amenable number.

51311628 is an abundant number, since it is smaller than the sum of its proper divisors (85221132).

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

51311628 is a wasteful number, since it uses less digits than its factorization.

51311628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75046 (or 75041 counting only the distinct ones).

The product of its digits is 1440, while the sum is 27.

The square root of 51311628 is about 7163.2135246689. The cubic root of 51311628 is about 371.5967708476.

The spelling of 51311628 in words is "fifty-one million, three hundred eleven thousand, six hundred twenty-eight".