72972124636 has 6 divisors (see below), whose sum is σ = 127701218120. Its totient is φ = 36486062316.

The previous prime is 72972124607. The next prime is 72972124649. The reversal of 72972124636 is 63642127927.

It is a self number, because there is not a number n which added to its sum of digits gives 72972124636.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9121515576 + ... + 9121515583.

Almost surely, 2^72972124636 is an apocalyptic number.

It is an amenable number.

72972124636 is a deficient number, since it is larger than the sum of its proper divisors (54729093484).

72972124636 is a wasteful number, since it uses less digits than its factorization.

72972124636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18243031163 (or 18243031161 counting only the distinct ones).

The product of its digits is 1524096, while the sum is 49.

The spelling of 72972124636 in words is "seventy-two billion, nine hundred seventy-two million, one hundred twenty-four thousand, six hundred thirty-six".