66472864 has 24 divisors (see below), whose sum is σ = 131459328. Its totient is φ = 33086400.

The previous prime is 66472853. The next prime is 66472877. The reversal of 66472864 is 46827466.

It is a self number, because there is not a number n which added to its sum of digits gives 66472864.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2689 + ... + 11839.

It is an arithmetic number, because the mean of its divisors is an integer number (5477472).

Almost surely, 2^66472864 is an apocalyptic number.

It is an amenable number.

66472864 is a deficient number, since it is larger than the sum of its proper divisors (64986464).

66472864 is a wasteful number, since it uses less digits than its factorization.

66472864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9388 (or 9380 counting only the distinct ones).

The product of its digits is 387072, while the sum is 43.

The square root of 66472864 is about 8153.0892304696. The cubic root of 66472864 is about 405.0868360263.

The spelling of 66472864 in words is "sixty-six million, four hundred seventy-two thousand, eight hundred sixty-four".