667440684 has 36 divisors (see below), whose sum is σ = 1745321760. Its totient is φ = 214808160.

The previous prime is 667440673. The next prime is 667440691. The reversal of 667440684 is 486044766.

It is a tau number, because it is divible by the number of its divisors (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 318612 + ... + 320699.

It is an arithmetic number, because the mean of its divisors is an integer number (48481160).

Almost surely, 2^667440684 is an apocalyptic number.

It is an amenable number.

667440684 is an abundant number, since it is smaller than the sum of its proper divisors (1077881076).

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

667440684 is a wasteful number, since it uses less digits than its factorization.

667440684 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 639350 (or 639345 counting only the distinct ones).

The product of its (nonzero) digits is 774144, while the sum is 45.

The square root of 667440684 is about 25834.8734078571. The cubic root of 667440684 is about 873.9184171904.

The spelling of 667440684 in words is "six hundred sixty-seven million, four hundred forty thousand, six hundred eighty-four".