57081384 has 24 divisors (see below), whose sum is σ = 154595610. Its totient is φ = 19027104.

The previous prime is 57081361. The next prime is 57081391. The reversal of 57081384 is 48318075.

57081384 is a `hidden beast` number, since 570 + 8 + 1 + 3 + 84 = 666.

It can be written as a sum of positive squares in only one way, i.e., 40678884 + 16402500 = 6378^2 + 4050^2 .

It is a tau number, because it is divible by the number of its divisors (24).

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

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, 396327 + ... + 396470.

Almost surely, 2^57081384 is an apocalyptic number.

It is an amenable number.

57081384 is an abundant number, since it is smaller than the sum of its proper divisors (97514226).

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

57081384 is a wasteful number, since it uses less digits than its factorization.

57081384 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 792809 (or 792802 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 36.

The square root of 57081384 is about 7555.2222998400. Note that the first 4 decimals coincide. The cubic root of 57081384 is about 385.0331876715.

The spelling of 57081384 in words is "fifty-seven million, eighty-one thousand, three hundred eighty-four".