667688920 has 32 divisors (see below), whose sum is σ = 1526933520. Its totient is φ = 262696320.

The previous prime is 667688893. The next prime is 667688929. The reversal of 667688920 is 29886766.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667688929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 134382 + ... + 139261.

Almost surely, 2^667688920 is an apocalyptic number.

It is an amenable number.

667688920 is an abundant number, since it is smaller than the sum of its proper divisors (859244600).

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

667688920 is a wasteful number, since it uses less digits than its factorization.

667688920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 273715 (or 273711 counting only the distinct ones).

The product of its (nonzero) digits is 1741824, while the sum is 52.

The square root of 667688920 is about 25839.6772425663. The cubic root of 667688920 is about 874.0267469782.

The spelling of 667688920 in words is "six hundred sixty-seven million, six hundred eighty-eight thousand, nine hundred twenty".