57686381 has 4 divisors (see below), whose sum is σ = 59547264. Its totient is φ = 55825500.

The previous prime is 57686359. The next prime is 57686383. The reversal of 57686381 is 18368675.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-57686381 is a prime.

It is a super-2 number, since 2×57686381² = 6655437105754322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57686383) 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, 930395 + ... + 930456.

It is an arithmetic number, because the mean of its divisors is an integer number (14886816).

Almost surely, 2^57686381 is an apocalyptic number.

It is an amenable number.

57686381 is a deficient number, since it is larger than the sum of its proper divisors (1860883).

57686381 is a wasteful number, since it uses less digits than its factorization.

57686381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1860882.

The product of its digits is 241920, while the sum is 44.

The square root of 57686381 is about 7595.1551004571. The cubic root of 57686381 is about 386.3887128294.

The spelling of 57686381 in words is "fifty-seven million, six hundred eighty-six thousand, three hundred eighty-one".