57081366 has 12 divisors (see below), whose sum is σ = 123676332. Its totient is φ = 19027116.

The previous prime is 57081361. The next prime is 57081391. The reversal of 57081366 is 66318075.

57081366 is a `hidden beast` number, since 570 + 81 + 3 + 6 + 6 = 666.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 57081366.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57081361) 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, 1585576 + ... + 1585611.

It is an arithmetic number, because the mean of its divisors is an integer number (10306361).

Almost surely, 2^57081366 is an apocalyptic number.

57081366 is an abundant number, since it is smaller than the sum of its proper divisors (66594966).

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

57081366 is a wasteful number, since it uses less digits than its factorization.

57081366 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3171195 (or 3171192 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 36.

The square root of 57081366 is about 7555.2211086109. The cubic root of 57081366 is about 385.0331471995.

The spelling of 57081366 in words is "fifty-seven million, eighty-one thousand, three hundred sixty-six".