667968732 has 18 divisors (see below), whose sum is σ = 1688476608. Its totient is φ = 222656232.

The previous prime is 667968703. The next prime is 667968739. The reversal of 667968732 is 237869766.

667968732 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667968739) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9277308 + ... + 9277379.

It is an arithmetic number, because the mean of its divisors is an integer number (93804256).

Almost surely, 2^667968732 is an apocalyptic number.

It is an amenable number.

667968732 is an abundant number, since it is smaller than the sum of its proper divisors (1020507876).

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

667968732 is a wasteful number, since it uses less digits than its factorization.

667968732 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18554697 (or 18554692 counting only the distinct ones).

The product of its digits is 4572288, while the sum is 54.

The square root of 667968732 is about 25845.0910619406. The cubic root of 667968732 is about 874.1488242956.

The spelling of 667968732 in words is "six hundred sixty-seven million, nine hundred sixty-eight thousand, seven hundred thirty-two".