57643521 has 32 divisors (see below), whose sum is σ = 87077760. Its totient is φ = 33675264.

The previous prime is 57643519. The next prime is 57643529. The reversal of 57643521 is 12534675.

It is not a de Polignac number, because 57643521 - 2¹ = 57643519 is a prime.

It is not an unprimeable number, because it can be changed into a prime (57643529) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 61585 + ... + 62513.

It is an arithmetic number, because the mean of its divisors is an integer number (2721180).

Almost surely, 2^57643521 is an apocalyptic number.

It is an amenable number.

57643521 is a deficient number, since it is larger than the sum of its proper divisors (29434239).

57643521 is a wasteful number, since it uses less digits than its factorization.

57643521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1025.

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

The square root of 57643521 is about 7592.3330406404. Note that the first 3 decimals coincide. The cubic root of 57643521 is about 386.2929957060.

The spelling of 57643521 in words is "fifty-seven million, six hundred forty-three thousand, five hundred twenty-one".