81472920476 has 24 divisors (see below), whose sum is σ = 143680387200. Its totient is φ = 40421937600.

The previous prime is 81472920469. The next prime is 81472920481. The reversal of 81472920476 is 67402927418.

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 7 ways as a sum of consecutive naturals, for example, 521666 + ... + 659606.

It is an arithmetic number, because the mean of its divisors is an integer number (5986682800).

Almost surely, 2^81472920476 is an apocalyptic number.

It is an amenable number.

81472920476 is a deficient number, since it is larger than the sum of its proper divisors (62207466724).

81472920476 is a wasteful number, since it uses less digits than its factorization.

81472920476 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139085 (or 139083 counting only the distinct ones).

The product of its (nonzero) digits is 1354752, while the sum is 50.

The spelling of 81472920476 in words is "eighty-one billion, four hundred seventy-two million, nine hundred twenty thousand, four hundred seventy-six".