81079200976 has 120 divisors (see below), whose sum is σ = 165969130272. Its totient is φ = 38360044800.

The previous prime is 81079200919. The next prime is 81079201013. The reversal of 81079200976 is 67900297018.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 217370326 + ... + 217370698.

Almost surely, 2^81079200976 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 81079200976, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (82984565136).

81079200976 is an abundant number, since it is smaller than the sum of its proper divisors (84889929296).

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

81079200976 is a wasteful number, since it uses less digits than its factorization.

81079200976 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 721 (or 684 counting only the distinct ones).

The product of its (nonzero) digits is 381024, while the sum is 49.

The spelling of 81079200976 in words is "eighty-one billion, seventy-nine million, two hundred thousand, nine hundred seventy-six".