66028972 has 6 divisors (see below), whose sum is σ = 115550708. Its totient is φ = 33014484.

The previous prime is 66028957. The next prime is 66028997. The reversal of 66028972 is 27982066.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8253618 + ... + 8253625.

Almost surely, 2^66028972 is an apocalyptic number.

It is an amenable number.

66028972 is a deficient number, since it is larger than the sum of its proper divisors (49521736).

66028972 is a wasteful number, since it uses less digits than its factorization.

66028972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16507247 (or 16507245 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 40.

The square root of 66028972 is about 8125.8213123351. The cubic root of 66028972 is about 404.1831261421.

The spelling of 66028972 in words is "sixty-six million, twenty-eight thousand, nine hundred seventy-two".