57018420 has 36 divisors (see below), whose sum is σ = 172956420. Its totient is φ = 15204864.

The previous prime is 57018397. The next prime is 57018421. The reversal of 57018420 is 2481075.

It can be written as a sum of positive squares in 2 ways, for example, as 13220496 + 43797924 = 3636^2 + 6618^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×57018420² = 6502200438592800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57018421) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 158205 + ... + 158564.

It is an arithmetic number, because the mean of its divisors is an integer number (4804345).

Almost surely, 2^57018420 is an apocalyptic number.

It is an amenable number.

57018420 is an abundant number, since it is smaller than the sum of its proper divisors (115938000).

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

57018420 is a wasteful number, since it uses less digits than its factorization.

57018420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 316784 (or 316779 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 27.

The square root of 57018420 is about 7551.0542310329. The cubic root of 57018420 is about 384.8915644470.

Adding to 57018420 its reverse (2481075), we get a palindrome (59499495).

The spelling of 57018420 in words is "fifty-seven million, eighteen thousand, four hundred twenty".