66964972 has 24 divisors (see below), whose sum is σ = 127113840. Its totient is φ = 30743040.

The previous prime is 66964969. The next prime is 66964993. The reversal of 66964972 is 27946966.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9222 + ... + 14797.

It is an arithmetic number, because the mean of its divisors is an integer number (5296410).

Almost surely, 2^66964972 is an apocalyptic number.

It is an amenable number.

66964972 is a deficient number, since it is larger than the sum of its proper divisors (60148868).

66964972 is a wasteful number, since it uses less digits than its factorization.

66964972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24081 (or 24079 counting only the distinct ones).

The product of its digits is 979776, while the sum is 49.

The square root of 66964972 is about 8183.2128164921. The cubic root of 66964972 is about 406.0840176531.

The spelling of 66964972 in words is "sixty-six million, nine hundred sixty-four thousand, nine hundred seventy-two".