81324948100 has 72 divisors (see below), whose sum is σ = 193744974528. Its totient is φ = 29384284800.

The previous prime is 81324948097. The next prime is 81324948137. The reversal of 81324948100 is 184942318.

It is a super-2 number, since 2×81324948100² (a number of 23 digits) contains 22 as substring.

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, 62752 + ... + 408151.

It is an arithmetic number, because the mean of its divisors is an integer number (2690902424).

Almost surely, 2^81324948100 is an apocalyptic number.

It is an amenable number.

81324948100 is an abundant number, since it is smaller than the sum of its proper divisors (112420026428).

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

81324948100 is a wasteful number, since it uses less digits than its factorization.

81324948100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 471085 (or 471078 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 40.

The spelling of 81324948100 in words is "eighty-one billion, three hundred twenty-four million, nine hundred forty-eight thousand, one hundred".