667912968 has 24 divisors (see below), whose sum is σ = 1808931150. Its totient is φ = 222637632.

The previous prime is 667912967. The next prime is 667912979. The reversal of 667912968 is 869219766.

667912968 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 374887044 + 293025924 = 19362^2 + 17118^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is a super-2 number, since 2×667912968² = 892215465645138048, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (667912963) 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, 4638213 + ... + 4638356.

Almost surely, 2^667912968 is an apocalyptic number.

It is an amenable number.

667912968 is an abundant number, since it is smaller than the sum of its proper divisors (1141018182).

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

667912968 is a wasteful number, since it uses less digits than its factorization.

667912968 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9276581 (or 9276574 counting only the distinct ones).

The product of its digits is 1959552, while the sum is 54.

The square root of 667912968 is about 25844.0122272065. The cubic root of 667912968 is about 874.1244981112.

The spelling of 667912968 in words is "six hundred sixty-seven million, nine hundred twelve thousand, nine hundred sixty-eight".