72987580666 has 384 divisors, whose sum is σ = 170915512320. Its totient is φ = 22581504000.

The previous prime is 72987580663. The next prime is 72987580711. The reversal of 72987580666 is 66608578927.

It is a junction number, because it is equal to n+sod(n) for n = 72987580598 and 72987580607.

It is not an unprimeable number, because it can be changed into a prime (72987580663) by changing a digit.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 220506121 + ... + 220506451.

It is an arithmetic number, because the mean of its divisors is an integer number (445092480).

Almost surely, 2^72987580666 is an apocalyptic number.

72987580666 is an abundant number, since it is smaller than the sum of its proper divisors (97927931654).

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

72987580666 is a wasteful number, since it uses less digits than its factorization.

72987580666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 442 (or 431 counting only the distinct ones).

The product of its (nonzero) digits is 60963840, while the sum is 64.

The spelling of 72987580666 in words is "seventy-two billion, nine hundred eighty-seven million, five hundred eighty thousand, six hundred sixty-six".