82591985 has 16 divisors (see below), whose sum is σ = 113520000. Its totient is φ = 56509056.

The previous prime is 82591979. The next prime is 82591997. The reversal of 82591985 is 58919528.

It is a cyclic number.

It is not a de Polignac number, because 82591985 - 2⁶ = 82591921 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15101 + ... + 19829.

It is an arithmetic number, because the mean of its divisors is an integer number (7095000).

Almost surely, 2^82591985 is an apocalyptic number.

It is an amenable number.

82591985 is a deficient number, since it is larger than the sum of its proper divisors (30928015).

82591985 is a wasteful number, since it uses less digits than its factorization.

82591985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5240.

The product of its digits is 259200, while the sum is 47.

The square root of 82591985 is about 9088.0132592333. The cubic root of 82591985 is about 435.4911174885.

The spelling of 82591985 in words is "eighty-two million, five hundred ninety-one thousand, nine hundred eighty-five".