66979572 has 24 divisors (see below), whose sum is σ = 170493792. Its totient is φ = 20296800.

The previous prime is 66979553. The next prime is 66979613. The reversal of 66979572 is 27597966.

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, 253579 + ... + 253842.

It is an arithmetic number, because the mean of its divisors is an integer number (7103908).

Almost surely, 2^66979572 is an apocalyptic number.

It is an amenable number.

66979572 is an abundant number, since it is smaller than the sum of its proper divisors (103514220).

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

66979572 is a wasteful number, since it uses less digits than its factorization.

66979572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 507439 (or 507437 counting only the distinct ones).

The product of its digits is 1428840, while the sum is 51.

The square root of 66979572 is about 8184.1048380382. The cubic root of 66979572 is about 406.1135275877.

The spelling of 66979572 in words is "sixty-six million, nine hundred seventy-nine thousand, five hundred seventy-two".