66976768 has 22 divisors (see below), whose sum is σ = 133890176. Its totient is φ = 33487872.

The previous prime is 66976717. The next prime is 66976769. The reversal of 66976768 is 86767966.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66976769) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31680 + ... + 33727.

Almost surely, 2^66976768 is an apocalyptic number.

It is an amenable number.

66976768 is a deficient number, since it is larger than the sum of its proper divisors (66913408).

66976768 is an equidigital number, since it uses as much as digits as its factorization.

66976768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65427 (or 65409 counting only the distinct ones).

The product of its digits is 4572288, while the sum is 55.

The square root of 66976768 is about 8183.9335285668. The cubic root of 66976768 is about 406.1078603960.

The spelling of 66976768 in words is "sixty-six million, nine hundred seventy-six thousand, seven hundred sixty-eight".