82139731992 has 128 divisors (see below), whose sum is σ = 232660382400. Its totient is φ = 26841424896.

The previous prime is 82139731987. The next prime is 82139732021. The reversal of 82139731992 is 29913793128.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 20066298 + ... + 20070390.

Almost surely, 2^82139731992 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 82139731992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (116330191200).

82139731992 is an abundant number, since it is smaller than the sum of its proper divisors (150520650408).

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

82139731992 is a wasteful number, since it uses less digits than its factorization.

82139731992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5914 (or 5904 counting only the distinct ones).

The product of its digits is 1469664, while the sum is 54.

The spelling of 82139731992 in words is "eighty-two billion, one hundred thirty-nine million, seven hundred thirty-one thousand, nine hundred ninety-two".