66879968 has 24 divisors (see below), whose sum is σ = 131854968. Its totient is φ = 33393024.

The previous prime is 66879961. The next prime is 66879971. The reversal of 66879968 is 86997866.

66879968 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66879961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37955 + ... + 39677.

It is an arithmetic number, because the mean of its divisors is an integer number (5493957).

Almost surely, 2^66879968 is an apocalyptic number.

It is an amenable number.

66879968 is a deficient number, since it is larger than the sum of its proper divisors (64975000).

66879968 is a wasteful number, since it uses less digits than its factorization.

66879968 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2946 (or 2938 counting only the distinct ones).

The product of its digits is 7838208, while the sum is 59.

The square root of 66879968 is about 8178.0173636402. The cubic root of 66879968 is about 405.9121199135.

The spelling of 66879968 in words is "sixty-six million, eight hundred seventy-nine thousand, nine hundred sixty-eight".