667540880 has 40 divisors (see below), whose sum is σ = 1553593272. Its totient is φ = 266747904.

The previous prime is 667540877. The next prime is 667540897. The reversal of 667540880 is 88045766.

It can be written as a sum of positive squares in 4 ways, for example, as 187580416 + 479960464 = 13696^2 + 21908^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×667540880² = 891221652942348800, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 88622 + ... + 95858.

Almost surely, 2^667540880 is an apocalyptic number.

It is an amenable number.

667540880 is an abundant number, since it is smaller than the sum of its proper divisors (886052392).

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

667540880 is a wasteful number, since it uses less digits than its factorization.

667540880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8403 (or 8397 counting only the distinct ones).

The product of its (nonzero) digits is 322560, while the sum is 44.

The square root of 667540880 is about 25836.8124969006. The cubic root of 667540880 is about 873.9621457946.

The spelling of 667540880 in words is "six hundred sixty-seven million, five hundred forty thousand, eight hundred eighty".