57781388 has 18 divisors (see below), whose sum is σ = 117626796. Its totient is φ = 24763368.

The previous prime is 57781331. The next prime is 57781417. The reversal of 57781388 is 88318775.

57781388 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 147206 + ... + 147597.

It is an arithmetic number, because the mean of its divisors is an integer number (6534822).

Almost surely, 2^57781388 is an apocalyptic number.

It is an amenable number.

57781388 is an abundant number, since it is smaller than the sum of its proper divisors (59845408).

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

57781388 is a wasteful number, since it uses less digits than its factorization.

57781388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 294821 (or 294812 counting only the distinct ones).

The product of its digits is 376320, while the sum is 47.

The square root of 57781388 is about 7601.4069750277. The cubic root of 57781388 is about 386.6007183736.

The spelling of 57781388 in words is "fifty-seven million, seven hundred eighty-one thousand, three hundred eighty-eight".