57645891 has 16 divisors (see below), whose sum is σ = 86851200. Its totient is φ = 37778184.

The previous prime is 57645869. The next prime is 57645899. The reversal of 57645891 is 19854675.

57645891 is a `hidden beast` number, since 5 + 7 + 64 + 589 + 1 = 666.

It is not a de Polignac number, because 57645891 - 2¹⁷ = 57514819 is a prime.

It is not an unprimeable number, because it can be changed into a prime (57645899) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16501 + ... + 19686.

It is an arithmetic number, because the mean of its divisors is an integer number (5428200).

Almost surely, 2^57645891 is an apocalyptic number.

57645891 is a deficient number, since it is larger than the sum of its proper divisors (29205309).

57645891 is a wasteful number, since it uses less digits than its factorization.

57645891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36255 (or 36249 counting only the distinct ones).

The product of its digits is 302400, while the sum is 45.

The square root of 57645891 is about 7592.4891175424. The cubic root of 57645891 is about 386.2982897491.

The spelling of 57645891 in words is "fifty-seven million, six hundred forty-five thousand, eight hundred ninety-one".