81622268772 has 48 divisors (see below), whose sum is σ = 214467907584. Its totient is φ = 23936148000.

The previous prime is 81622268753. The next prime is 81622268789. The reversal of 81622268772 is 27786222618.

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, 9969304 + ... + 9977487.

It is an arithmetic number, because the mean of its divisors is an integer number (4468081408).

Almost surely, 2^81622268772 is an apocalyptic number.

It is an amenable number.

81622268772 is an abundant number, since it is smaller than the sum of its proper divisors (132845638812).

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

81622268772 is a wasteful number, since it uses less digits than its factorization.

81622268772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19946840 (or 19946838 counting only the distinct ones).

The product of its digits is 1806336, while the sum is 51.

The spelling of 81622268772 in words is "eighty-one billion, six hundred twenty-two million, two hundred sixty-eight thousand, seven hundred seventy-two".