667994560 has 28 divisors (see below), whose sum is σ = 1590662808. Its totient is φ = 267197696.

The previous prime is 667994557. The next prime is 667994581. The reversal of 667994560 is 65499766.

It is a junction number, because it is equal to n+sod(n) for n = 667994498 and 667994507.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 1043422 + ... + 1044061.

It is an arithmetic number, because the mean of its divisors is an integer number (56809386).

Almost surely, 2^667994560 is an apocalyptic number.

It is an amenable number.

667994560 is an abundant number, since it is smaller than the sum of its proper divisors (922668248).

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

667994560 is a wasteful number, since it uses less digits than its factorization.

667994560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2087500 (or 2087490 counting only the distinct ones).

The product of its (nonzero) digits is 2449440, while the sum is 52.

The square root of 667994560 is about 25845.5907264663. The cubic root of 667994560 is about 874.1600909032.

The spelling of 667994560 in words is "six hundred sixty-seven million, nine hundred ninety-four thousand, five hundred sixty".