81079942488 has 32 divisors (see below), whose sum is σ = 204295925760. Its totient is φ = 26813838240.

The previous prime is 81079942483. The next prime is 81079942499. The reversal of 81079942488 is 88424997018.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81079942483) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13297468 + ... + 13303563.

It is an arithmetic number, because the mean of its divisors is an integer number (6384247680).

Almost surely, 2^81079942488 is an apocalyptic number.

It is an amenable number.

81079942488 is an abundant number, since it is smaller than the sum of its proper divisors (123215983272).

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

81079942488 is a wasteful number, since it uses less digits than its factorization.

81079942488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26601167 (or 26601163 counting only the distinct ones).

The product of its (nonzero) digits is 9289728, while the sum is 60.

The spelling of 81079942488 in words is "eighty-one billion, seventy-nine million, nine hundred forty-two thousand, four hundred eighty-eight".