66704868 has 72 divisors (see below), whose sum is σ = 176912736. Its totient is φ = 21168000.

The previous prime is 66704857. The next prime is 66704893. The reversal of 66704868 is 86840766.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 62943 + ... + 63993.

Almost surely, 2^66704868 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66704868, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (88456368).

66704868 is an abundant number, since it is smaller than the sum of its proper divisors (110207868).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66704868 is a wasteful number, since it uses less digits than its factorization.

66704868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1145 (or 1140 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 45.

The square root of 66704868 is about 8167.3048186045. The cubic root of 66704868 is about 405.5575676582.

The spelling of 66704868 in words is "sixty-six million, seven hundred four thousand, eight hundred sixty-eight".