57018381 has 8 divisors (see below), whose sum is σ = 86885184. Its totient is φ = 32581920.

The previous prime is 57018371. The next prime is 57018383. The reversal of 57018381 is 18381075.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 57018381 - 2⁵ = 57018349 is a prime.

It is a super-2 number, since 2×57018381² = 6502191543722322, which contains 22 as substring.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57018383) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1357560 + ... + 1357601.

It is an arithmetic number, because the mean of its divisors is an integer number (10860648).

Almost surely, 2^57018381 is an apocalyptic number.

It is an amenable number.

57018381 is a deficient number, since it is larger than the sum of its proper divisors (29866803).

57018381 is a wasteful number, since it uses less digits than its factorization.

57018381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2715171.

The product of its (nonzero) digits is 6720, while the sum is 33.

The square root of 57018381 is about 7551.0516486116. The cubic root of 57018381 is about 384.8914766931.

The spelling of 57018381 in words is "fifty-seven million, eighteen thousand, three hundred eighty-one".