82640831 has 12 divisors (see below), whose sum is σ = 102272112. Its totient is φ = 65385216.

The previous prime is 82640827. The next prime is 82640843. The reversal of 82640831 is 13804628.

It is not a de Polignac number, because 82640831 - 2² = 82640827 is a prime.

It is a super-2 number, since 2×82640831² = 13659013896741122, 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 (82640801) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 33746 + ... + 36111.

It is an arithmetic number, because the mean of its divisors is an integer number (8522676).

Almost surely, 2^82640831 is an apocalyptic number.

82640831 is a deficient number, since it is larger than the sum of its proper divisors (19631281).

82640831 is a wasteful number, since it uses less digits than its factorization.

82640831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69890 (or 69877 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 32.

The square root of 82640831 is about 9090.7002480557. The cubic root of 82640831 is about 435.5769523185.

The spelling of 82640831 in words is "eighty-two million, six hundred forty thousand, eight hundred thirty-one".