57887391 has 4 divisors (see below), whose sum is σ = 77183192. Its totient is φ = 38591592.

The previous prime is 57887387. The next prime is 57887407. The reversal of 57887391 is 19378875.

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

It is not a de Polignac number, because 57887391 - 2² = 57887387 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 57887391.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57887311) 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, 9647896 + ... + 9647901.

It is an arithmetic number, because the mean of its divisors is an integer number (19295798).

Almost surely, 2^57887391 is an apocalyptic number.

57887391 is a deficient number, since it is larger than the sum of its proper divisors (19295801).

57887391 is a wasteful number, since it uses less digits than its factorization.

57887391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19295800.

The product of its digits is 423360, while the sum is 48.

The square root of 57887391 is about 7608.3763708166. The cubic root of 57887391 is about 386.8369870775.

The spelling of 57887391 in words is "fifty-seven million, eight hundred eighty-seven thousand, three hundred ninety-one".