57393891 has 12 divisors (see below), whose sum is σ = 84924840. Its totient is φ = 37329120.

The previous prime is 57393877. The next prime is 57393907. The reversal of 57393891 is 19839375.

It is a happy number.

It is not a de Polignac number, because 57393891 - 2⁹ = 57393379 is a prime.

It is not an unprimeable number, because it can be changed into a prime (57393811) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 77401 + ... + 78138.

It is an arithmetic number, because the mean of its divisors is an integer number (7077070).

Almost surely, 2^57393891 is an apocalyptic number.

57393891 is a deficient number, since it is larger than the sum of its proper divisors (27530949).

57393891 is a wasteful number, since it uses less digits than its factorization.

57393891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155586 (or 155583 counting only the distinct ones).

The product of its digits is 204120, while the sum is 45.

The square root of 57393891 is about 7575.8755929595. The cubic root of 57393891 is about 385.7345643072.

The spelling of 57393891 in words is "fifty-seven million, three hundred ninety-three thousand, eight hundred ninety-one".