66808902 has 64 divisors (see below), whose sum is σ = 147962880. Its totient is φ = 20030976.

The previous prime is 66808891. The next prime is 66808909. The reversal of 66808902 is 20980866.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66808909) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 198078 + ... + 198414.

It is an arithmetic number, because the mean of its divisors is an integer number (2311920).

Almost surely, 2^66808902 is an apocalyptic number.

66808902 is an abundant number, since it is smaller than the sum of its proper divisors (81153978).

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

66808902 is a wasteful number, since it uses less digits than its factorization.

66808902 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 445.

The product of its (nonzero) digits is 41472, while the sum is 39.

The square root of 66808902 is about 8173.6712681634. The cubic root of 66808902 is about 405.7682962098.

The spelling of 66808902 in words is "sixty-six million, eight hundred eight thousand, nine hundred two".