667957820 has 12 divisors (see below), whose sum is σ = 1402711464. Its totient is φ = 267183120.

The previous prime is 667957799. The next prime is 667957859. The reversal of 667957820 is 28759766.

667957820 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a hoax number, since the sum of its digits (50) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16698926 + ... + 16698965.

It is an arithmetic number, because the mean of its divisors is an integer number (116892622).

Almost surely, 2^667957820 is an apocalyptic number.

It is an amenable number.

667957820 is an abundant number, since it is smaller than the sum of its proper divisors (734753644).

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

667957820 is a wasteful number, since it uses less digits than its factorization.

667957820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33397900 (or 33397898 counting only the distinct ones).

The product of its (nonzero) digits is 1270080, while the sum is 50.

The square root of 667957820 is about 25844.8799571598. The cubic root of 667957820 is about 874.1440642106.

The spelling of 667957820 in words is "six hundred sixty-seven million, nine hundred fifty-seven thousand, eight hundred twenty".