57215643 has 4 divisors (see below), whose sum is σ = 76287528. Its totient is φ = 38143760.

The previous prime is 57215633. The next prime is 57215657. The reversal of 57215643 is 34651275.

57215643 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 57215643 - 2¹⁷ = 57084571 is a prime.

It is a super-3 number, since 3×57215643³ (a number of 24 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (57215633) 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 3 ways as a sum of consecutive naturals, for example, 9535938 + ... + 9535943.

It is an arithmetic number, because the mean of its divisors is an integer number (19071882).

Almost surely, 2^57215643 is an apocalyptic number.

57215643 is a deficient number, since it is larger than the sum of its proper divisors (19071885).

57215643 is a wasteful number, since it uses less digits than its factorization.

57215643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19071884.

The product of its digits is 25200, while the sum is 33.

The square root of 57215643 is about 7564.1022600174. The cubic root of 57215643 is about 385.3348253841.

The spelling of 57215643 in words is "fifty-seven million, two hundred fifteen thousand, six hundred forty-three".