51768978 has 32 divisors (see below), whose sum is σ = 112311360. Its totient is φ = 15843840.

The previous prime is 51768967. The next prime is 51768989. The reversal of 51768978 is 87986715.

It is an interprime number because it is at equal distance from previous prime (51768967) and next prime (51768989).

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a self number, because there is not a number n which added to its sum of digits gives 51768978.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2008 + ... + 10371.

It is an arithmetic number, because the mean of its divisors is an integer number (3509730).

Almost surely, 2^51768978 is an apocalyptic number.

51768978 is an abundant number, since it is smaller than the sum of its proper divisors (60542382).

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

51768978 is a wasteful number, since it uses less digits than its factorization.

51768978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12442.

The product of its digits is 846720, while the sum is 51.

The square root of 51768978 is about 7195.0662262414. The cubic root of 51768978 is about 372.6975436747.

The spelling of 51768978 in words is "fifty-one million, seven hundred sixty-eight thousand, nine hundred seventy-eight".