51684768 has 36 divisors (see below), whose sum is σ = 146979378. Its totient is φ = 17228160.

The previous prime is 51684761. The next prime is 51684799. The reversal of 51684768 is 86748615.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 51667344 + 17424 = 7188^2 + 132^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (51684761) 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, 89443 + ... + 90018.

Almost surely, 2^51684768 is an apocalyptic number.

It is an amenable number.

51684768 is an abundant number, since it is smaller than the sum of its proper divisors (95294610).

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

51684768 is a wasteful number, since it uses less digits than its factorization.

51684768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179477 (or 179466 counting only the distinct ones).

The product of its digits is 322560, while the sum is 45.

The square root of 51684768 is about 7189.2119178669. The cubic root of 51684768 is about 372.4953512024.

The spelling of 51684768 in words is "fifty-one million, six hundred eighty-four thousand, seven hundred sixty-eight".