66788868 has 24 divisors (see below), whose sum is σ = 157977568. Its totient is φ = 21957696.

The previous prime is 66788831. The next prime is 66788873. The reversal of 66788868 is 86888766.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37246 + ... + 38997.

Almost surely, 2^66788868 is an apocalyptic number.

It is an amenable number.

66788868 is an abundant number, since it is smaller than the sum of its proper divisors (91188700).

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

66788868 is a wasteful number, since it uses less digits than its factorization.

66788868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76323 (or 76321 counting only the distinct ones).

The product of its digits is 6193152, while the sum is 57.

The square root of 66788868 is about 8172.4456559833. The cubic root of 66788868 is about 405.7277328791.

The spelling of 66788868 in words is "sixty-six million, seven hundred eighty-eight thousand, eight hundred sixty-eight".