667804984 has 64 divisors (see below), whose sum is σ = 1583193600. Its totient is φ = 256502400.

The previous prime is 667804967. The next prime is 667804987. The reversal of 667804984 is 489408766.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667804987) 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 15 ways as a sum of consecutive naturals, for example, 36102 + ... + 51370.

It is an arithmetic number, because the mean of its divisors is an integer number (24737400).

Almost surely, 2^667804984 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 667804984, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (791596800).

667804984 is an abundant number, since it is smaller than the sum of its proper divisors (915388616).

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

667804984 is a wasteful number, since it uses less digits than its factorization.

667804984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15364 (or 15360 counting only the distinct ones).

The product of its (nonzero) digits is 2322432, while the sum is 52.

The square root of 667804984 is about 25841.9229934616. The cubic root of 667804984 is about 874.0773879079.

The spelling of 667804984 in words is "six hundred sixty-seven million, eight hundred four thousand, nine hundred eighty-four".