57215655 has 48 divisors (see below), whose sum is σ = 115075584. Its totient is φ = 25755840.

The previous prime is 57215633. The next prime is 57215657. The reversal of 57215655 is 55651275.

It is a happy number.

57215655 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 57215655 - 2⁷ = 57215527 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57215657) by changing a digit.

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 47 ways as a sum of consecutive naturals, for example, 19750 + ... + 22460.

It is an arithmetic number, because the mean of its divisors is an integer number (2397408).

Almost surely, 2^57215655 is an apocalyptic number.

57215655 is an abundant number, since it is smaller than the sum of its proper divisors (57859929).

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

57215655 is a wasteful number, since it uses less digits than its factorization.

57215655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2796 (or 2793 counting only the distinct ones).

The product of its digits is 52500, while the sum is 36.

The square root of 57215655 is about 7564.1030532377. The cubic root of 57215655 is about 385.3348523232.

The spelling of 57215655 in words is "fifty-seven million, two hundred fifteen thousand, six hundred fifty-five".