557865 has 72 divisors (see below), whose sum is σ = 1280448. Its totient is φ = 221760.

The previous prime is 557863. The next prime is 557891. The reversal of 557865 is 568755.

It is not a de Polignac number, because 557865 - 2¹ = 557863 is a prime.

It is a super-2 number, since 2×557865² = 622426716450, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (557861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 24244 + ... + 24266.

It is an arithmetic number, because the mean of its divisors is an integer number (17784).

2⁵⁵⁷⁸⁶⁵ is an apocalyptic number.

557865 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

557865 is an abundant number, since it is smaller than the sum of its proper divisors (722583).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

557865 is a wasteful number, since it uses less digits than its factorization.

557865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59 (or 49 counting only the distinct ones).

The product of its digits is 42000, while the sum is 36.

The square root of 557865 is about 746.9036082387. The cubic root of 557865 is about 82.3208232598.

The spelling of 557865 in words is "five hundred fifty-seven thousand, eight hundred sixty-five".