66790680 has 64 divisors (see below), whose sum is σ = 218592000. Its totient is φ = 16191360.

The previous prime is 66790679. The next prime is 66790699. The reversal of 66790680 is 8609766.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23980 + ... + 26619.

It is an arithmetic number, because the mean of its divisors is an integer number (3415500).

Almost surely, 2^66790680 is an apocalyptic number.

66790680 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66790680 is an abundant number, since it is smaller than the sum of its proper divisors (151801320).

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

66790680 is a wasteful number, since it uses less digits than its factorization.

66790680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50624 (or 50620 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 42.

The square root of 66790680 is about 8172.5565155586. The cubic root of 66790680 is about 405.7314020135.

The spelling of 66790680 in words is "sixty-six million, seven hundred ninety thousand, six hundred eighty".