57685391 has 4 divisors (see below), whose sum is σ = 57810984. Its totient is φ = 57559800.

The previous prime is 57685373. The next prime is 57685393. The reversal of 57685391 is 19358675.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-57685391 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57685393) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 62105 + ... + 63026.

It is an arithmetic number, because the mean of its divisors is an integer number (14452746).

Almost surely, 2^57685391 is an apocalyptic number.

57685391 is a deficient number, since it is larger than the sum of its proper divisors (125593).

57685391 is a wasteful number, since it uses less digits than its factorization.

57685391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125592.

The product of its digits is 226800, while the sum is 44.

The square root of 57685391 is about 7595.0899270516. The cubic root of 57685391 is about 386.3865024462.

The spelling of 57685391 in words is "fifty-seven million, six hundred eighty-five thousand, three hundred ninety-one".