82919979840 has 224 divisors, whose sum is σ = 269452465920. Its totient is φ = 21598617600.

The previous prime is 82919979787. The next prime is 82919979847. The reversal of 82919979840 is 4897991928.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82919979847) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7423860 + ... + 7435020.

Almost surely, 2^82919979840 is an apocalyptic number.

82919979840 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 82919979840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (134726232960).

82919979840 is an abundant number, since it is smaller than the sum of its proper divisors (186532486080).

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

82919979840 is a wasteful number, since it uses less digits than its factorization.

82919979840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11361 (or 11351 counting only the distinct ones).

The product of its (nonzero) digits is 23514624, while the sum is 66.

The spelling of 82919979840 in words is "eighty-two billion, nine hundred nineteen million, nine hundred seventy-nine thousand, eight hundred forty".