57115220 has 12 divisors (see below), whose sum is σ = 119942004. Its totient is φ = 22846080.

The previous prime is 57115213. The next prime is 57115229. The reversal of 57115220 is 2251175.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 30448324 + 26666896 = 5518^2 + 5164^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57115229) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1427861 + ... + 1427900.

It is an arithmetic number, because the mean of its divisors is an integer number (9995167).

Almost surely, 2^57115220 is an apocalyptic number.

It is an amenable number.

57115220 is an abundant number, since it is smaller than the sum of its proper divisors (62826784).

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

57115220 is a wasteful number, since it uses less digits than its factorization.

57115220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2855770 (or 2855768 counting only the distinct ones).

The product of its (nonzero) digits is 700, while the sum is 23.

The square root of 57115220 is about 7557.4612139263. The cubic root of 57115220 is about 385.1092510549.

Adding to 57115220 its reverse (2251175), we get a palindrome (59366395).

The spelling of 57115220 in words is "fifty-seven million, one hundred fifteen thousand, two hundred twenty".