84557 has 4 divisors (see below), whose sum is σ = 92256. Its totient is φ = 76860.

The previous prime is 84551. The next prime is 84559. The reversal of 84557 is 75548.

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-84557 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 (84551) 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, 3833 + ... + 3854.

It is an arithmetic number, because the mean of its divisors is an integer number (23064).

2⁸⁴⁵⁵⁷ is an apocalyptic number.

It is an amenable number.

84557 is a deficient number, since it is larger than the sum of its proper divisors (7699).

84557 is a wasteful number, since it uses less digits than its factorization.

84557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7698.

The product of its digits is 5600, while the sum is 29.

The square root of 84557 is about 290.7868635272. The cubic root of 84557 is about 43.8917794983.

Subtracting from 84557 its reverse (75548), we obtain a palindrome (9009).

The spelling of 84557 in words is "eighty-four thousand, five hundred fifty-seven".