51115968 has 56 divisors (see below), whose sum is σ = 150276560. Its totient is φ = 17038080.

The previous prime is 51115943. The next prime is 51115973. The reversal of 51115968 is 86951115.

51115968 is a `hidden beast` number, since 51 + 11 + 596 + 8 = 666.

It is a super-2 number, since 2×51115968² = 5225684369154048, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13063 + ... + 16518.

It is an arithmetic number, because the mean of its divisors is an integer number (2683510).

Almost surely, 2^51115968 is an apocalyptic number.

It is an amenable number.

51115968 is an abundant number, since it is smaller than the sum of its proper divisors (99160592).

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

51115968 is a wasteful number, since it uses less digits than its factorization.

51115968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29602 (or 29586 counting only the distinct ones).

The product of its digits is 10800, while the sum is 36.

The square root of 51115968 is about 7149.5432021913. The cubic root of 51115968 is about 371.1238485780.

The spelling of 51115968 in words is "fifty-one million, one hundred fifteen thousand, nine hundred sixty-eight".