57718991 has 8 divisors (see below), whose sum is σ = 63030144. Its totient is φ = 52418520.

The previous prime is 57718987. The next prime is 57719003. The reversal of 57718991 is 19981775.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 57718991 - 2² = 57718987 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 (57718951) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12320 + ... + 16346.

It is an arithmetic number, because the mean of its divisors is an integer number (7878768).

Almost surely, 2^57718991 is an apocalyptic number.

57718991 is a deficient number, since it is larger than the sum of its proper divisors (5311153).

57718991 is a wasteful number, since it uses less digits than its factorization.

57718991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5341.

The product of its digits is 158760, while the sum is 47.

The square root of 57718991 is about 7597.3015604226. The cubic root of 57718991 is about 386.4615073791.

The spelling of 57718991 in words is "fifty-seven million, seven hundred eighteen thousand, nine hundred ninety-one".