81623302028 has 12 divisors (see below), whose sum is σ = 143264640792. Its totient is φ = 40690547520.

The previous prime is 81623302001. The next prime is 81623302031. The reversal of 81623302028 is 82020332618.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30274358 + ... + 30277053.

It is an arithmetic number, because the mean of its divisors is an integer number (11938720066).

Almost surely, 2^81623302028 is an apocalyptic number.

It is an amenable number.

81623302028 is a deficient number, since it is larger than the sum of its proper divisors (61641338764).

81623302028 is a wasteful number, since it uses less digits than its factorization.

81623302028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60551752 (or 60551750 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 35.

The spelling of 81623302028 in words is "eighty-one billion, six hundred twenty-three million, three hundred two thousand, twenty-eight".