82639986 has 96 divisors (see below), whose sum is σ = 202383360. Its totient is φ = 22276800.

The previous prime is 82639979. The next prime is 82640021. The reversal of 82639986 is 68993628.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 345655 + ... + 345893.

It is an arithmetic number, because the mean of its divisors is an integer number (2108160).

Almost surely, 2^82639986 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 82639986, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (101191680).

82639986 is an abundant number, since it is smaller than the sum of its proper divisors (119743374).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

82639986 is a wasteful number, since it uses less digits than its factorization.

82639986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 312 (or 299 counting only the distinct ones).

The product of its digits is 1119744, while the sum is 51.

The square root of 82639986 is about 9090.6537718692. The cubic root of 82639986 is about 435.5754677264.

The spelling of 82639986 in words is "eighty-two million, six hundred thirty-nine thousand, nine hundred eighty-six".