66803988 has 24 divisors (see below), whose sum is σ = 156008160. Its totient is φ = 22249120.

The previous prime is 66803963. The next prime is 66804011. The reversal of 66803988 is 88930866.

It is a congruent number.

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, 26503 + ... + 28913.

It is an arithmetic number, because the mean of its divisors is an integer number (6500340).

Almost surely, 2^66803988 is an apocalyptic number.

It is an amenable number.

66803988 is an abundant number, since it is smaller than the sum of its proper divisors (89204172).

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

66803988 is a wasteful number, since it uses less digits than its factorization.

66803988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4727 (or 4725 counting only the distinct ones).

The product of its (nonzero) digits is 497664, while the sum is 48.

The square root of 66803988 is about 8173.3706633188. The cubic root of 66803988 is about 405.7583474642.

The spelling of 66803988 in words is "sixty-six million, eight hundred three thousand, nine hundred eighty-eight".