51716538 has 12 divisors (see below), whose sum is σ = 112052538. Its totient is φ = 17238840.

The previous prime is 51716531. The next prime is 51716543. The reversal of 51716538 is 83561715.

51716538 is a `hidden beast` number, since 51 + 71 + 6 + 538 = 666.

It can be written as a sum of positive squares in only one way, i.e., 45198729 + 6517809 = 6723^2 + 2553^2 .

It is not an unprimeable number, because it can be changed into a prime (51716531) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1436553 + ... + 1436588.

Almost surely, 2^51716538 is an apocalyptic number.

51716538 is an abundant number, since it is smaller than the sum of its proper divisors (60336000).

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

51716538 is a wasteful number, since it uses less digits than its factorization.

51716538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2873149 (or 2873146 counting only the distinct ones).

The product of its digits is 25200, while the sum is 36.

The square root of 51716538 is about 7191.4211391073. The cubic root of 51716538 is about 372.5716583610.

The spelling of 51716538 in words is "fifty-one million, seven hundred sixteen thousand, five hundred thirty-eight".