72221989688 has 32 divisors (see below), whose sum is σ = 142670668800. Its totient is φ = 34179871968.

The previous prime is 72221989613. The next prime is 72221989699. The reversal of 72221989688 is 88698912227.

It is a self number, because there is not a number n which added to its sum of digits gives 72221989688.

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, 40856 + ... + 382247.

It is an arithmetic number, because the mean of its divisors is an integer number (4458458400).

Almost surely, 2^72221989688 is an apocalyptic number.

It is an amenable number.

72221989688 is a deficient number, since it is larger than the sum of its proper divisors (70448679112).

72221989688 is a wasteful number, since it uses less digits than its factorization.

72221989688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 424251 (or 424247 counting only the distinct ones).

The product of its digits is 13934592, while the sum is 62.

The spelling of 72221989688 in words is "seventy-two billion, two hundred twenty-one million, nine hundred eighty-nine thousand, six hundred eighty-eight".