667305988 has 6 divisors (see below), whose sum is σ = 1167785486. Its totient is φ = 333652992.

The previous prime is 667305983. The next prime is 667306007. The reversal of 667305988 is 889503766.

It can be written as a sum of positive squares in only one way, i.e., 652189444 + 15116544 = 25538^2 + 3888^2 .

It is a super-2 number, since 2×667305988² = 890594563241312288, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (667305983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83413245 + ... + 83413252.

Almost surely, 2^667305988 is an apocalyptic number.

It is an amenable number.

667305988 is a deficient number, since it is larger than the sum of its proper divisors (500479498).

667305988 is a wasteful number, since it uses less digits than its factorization.

667305988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166826501 (or 166826499 counting only the distinct ones).

The product of its (nonzero) digits is 2177280, while the sum is 52.

The square root of 667305988 is about 25832.2664123766. The cubic root of 667305988 is about 873.8596248325.

The spelling of 667305988 in words is "six hundred sixty-seven million, three hundred five thousand, nine hundred eighty-eight".