57187220 has 24 divisors (see below), whose sum is σ = 121220064. Its totient is φ = 22660256.

The previous prime is 57187199. The next prime is 57187253. The reversal of 57187220 is 2278175.

57187220 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11222 + ... + 15501.

It is an arithmetic number, because the mean of its divisors is an integer number (5050836).

Almost surely, 2^57187220 is an apocalyptic number.

It is an amenable number.

57187220 is an abundant number, since it is smaller than the sum of its proper divisors (64032844).

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

57187220 is a wasteful number, since it uses less digits than its factorization.

57187220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26839 (or 26837 counting only the distinct ones).

The product of its (nonzero) digits is 7840, while the sum is 32.

The square root of 57187220 is about 7562.2232180755. The cubic root of 57187220 is about 385.2710072552.

The spelling of 57187220 in words is "fifty-seven million, one hundred eighty-seven thousand, two hundred twenty".