66986808 has 32 divisors (see below), whose sum is σ = 191391360. Its totient is φ = 19139040.

The previous prime is 66986807. The next prime is 66986813. The reversal of 66986808 is 80868966.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66986807) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 199198 + ... + 199533.

It is an arithmetic number, because the mean of its divisors is an integer number (5980980).

Almost surely, 2^66986808 is an apocalyptic number.

It is an amenable number.

66986808 is an abundant number, since it is smaller than the sum of its proper divisors (124404552).

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

66986808 is a wasteful number, since it uses less digits than its factorization.

66986808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 398747 (or 398743 counting only the distinct ones).

The product of its (nonzero) digits is 995328, while the sum is 51.

The square root of 66986808 is about 8184.5469025475. The cubic root of 66986808 is about 406.1281516070.

The spelling of 66986808 in words is "sixty-six million, nine hundred eighty-six thousand, eight hundred eight".