82585881 has 48 divisors (see below), whose sum is σ = 149385600. Its totient is φ = 42868224.

The previous prime is 82585871. The next prime is 82585883. The reversal of 82585881 is 18858528.

It is not a de Polignac number, because 82585881 - 2⁷ = 82585753 is a prime.

It is a super-2 number, since 2×82585881² = 13640855481092322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (82585883) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 29730 + ... + 32388.

It is an arithmetic number, because the mean of its divisors is an integer number (3112200).

Almost surely, 2^82585881 is an apocalyptic number.

It is an amenable number.

82585881 is a deficient number, since it is larger than the sum of its proper divisors (66799719).

82585881 is a wasteful number, since it uses less digits than its factorization.

82585881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2718 (or 2715 counting only the distinct ones).

The product of its digits is 204800, while the sum is 45.

The square root of 82585881 is about 9087.6774260534. The cubic root of 82585881 is about 435.4803888313.

The spelling of 82585881 in words is "eighty-two million, five hundred eighty-five thousand, eight hundred eighty-one".