55715778 has 12 divisors (see below), whose sum is σ = 120717558. Its totient is φ = 18571920.

The previous prime is 55715767. The next prime is 55715797. The reversal of 55715778 is 87751755.

55715778 is a `hidden beast` number, since 5 + 5 + 71 + 577 + 8 = 666.

It can be written as a sum of positive squares in only one way, i.e., 45198729 + 10517049 = 6723^2 + 3243^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1547643 + ... + 1547678.

Almost surely, 2^55715778 is an apocalyptic number.

55715778 is an abundant number, since it is smaller than the sum of its proper divisors (65001780).

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

55715778 is a wasteful number, since it uses less digits than its factorization.

55715778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3095329 (or 3095326 counting only the distinct ones).

The product of its digits is 343000, while the sum is 45.

The square root of 55715778 is about 7464.3002351192. The cubic root of 55715778 is about 381.9378799419.

The spelling of 55715778 in words is "fifty-five million, seven hundred fifteen thousand, seven hundred seventy-eight".