82857231 has 6 divisors (see below), whose sum is σ = 119682680. Its totient is φ = 55238148.

The previous prime is 82857227. The next prime is 82857251. The reversal of 82857231 is 13275828.

82857231 is a `hidden beast` number, since 82 + 8 + 572 + 3 + 1 = 666.

It is not a de Polignac number, because 82857231 - 2² = 82857227 is a prime.

It is a super-2 number, since 2×82857231² = 13730641457974722, 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 (82857251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4603171 + ... + 4603188.

Almost surely, 2^82857231 is an apocalyptic number.

82857231 is a deficient number, since it is larger than the sum of its proper divisors (36825449).

82857231 is a wasteful number, since it uses less digits than its factorization.

82857231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9206365 (or 9206362 counting only the distinct ones).

The product of its digits is 26880, while the sum is 36.

The square root of 82857231 is about 9102.5947399629. The cubic root of 82857231 is about 435.9568157857.

The spelling of 82857231 in words is "eighty-two million, eight hundred fifty-seven thousand, two hundred thirty-one".