81279487488 has 160 divisors (see below), whose sum is σ = 223010726400. Its totient is φ = 26294501376.

The previous prime is 81279487453. The next prime is 81279487511. The reversal of 81279487488 is 88478497218.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7153620 + ... + 7164972.

It is an arithmetic number, because the mean of its divisors is an integer number (1393817040).

Almost surely, 2^81279487488 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 81279487488, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (111505363200).

81279487488 is an abundant number, since it is smaller than the sum of its proper divisors (141731238912).

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

81279487488 is a wasteful number, since it uses less digits than its factorization.

81279487488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11512 (or 11496 counting only the distinct ones).

The product of its digits is 57802752, while the sum is 66.

The spelling of 81279487488 in words is "eighty-one billion, two hundred seventy-nine million, four hundred eighty-seven thousand, four hundred eighty-eight".