86557257 has 24 divisors (see below), whose sum is σ = 134971200. Its totient is φ = 53288928.

The previous prime is 86557253. The next prime is 86557267. The reversal of 86557257 is 75275568.

It is not a de Polignac number, because 86557257 - 2² = 86557253 is a prime.

It is not an unprimeable number, because it can be changed into a prime (86557253) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1207 + ... + 13212.

It is an arithmetic number, because the mean of its divisors is an integer number (5623800).

Almost surely, 2^86557257 is an apocalyptic number.

86557257 is a gapful number since it is divisible by the number (87) formed by its first and last digit.

It is an amenable number.

86557257 is a deficient number, since it is larger than the sum of its proper divisors (48413943).

86557257 is a wasteful number, since it uses less digits than its factorization.

86557257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14477 (or 14474 counting only the distinct ones).

The product of its digits is 588000, while the sum is 45.

The square root of 86557257 is about 9303.6152650462. The cubic root of 86557257 is about 442.3518301193.

The spelling of 86557257 in words is "eighty-six million, five hundred fifty-seven thousand, two hundred fifty-seven".