667855872 has 66 divisors (see below), whose sum is σ = 1928445948. Its totient is φ = 222615552.

The previous prime is 667855831. The next prime is 667855889. The reversal of 667855872 is 278558766.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 27018 + ... + 45449.

It is an arithmetic number, because the mean of its divisors is an integer number (29218878).

Almost surely, 2^667855872 is an apocalyptic number.

It is an amenable number.

667855872 is an abundant number, since it is smaller than the sum of its proper divisors (1260590076).

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

667855872 is a wasteful number, since it uses less digits than its factorization.

667855872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72493 (or 72472 counting only the distinct ones).

The product of its digits is 5644800, while the sum is 54.

The square root of 667855872 is about 25842.9075763545. The cubic root of 667855872 is about 874.0995894595.

The spelling of 667855872 in words is "six hundred sixty-seven million, eight hundred fifty-five thousand, eight hundred seventy-two".