667549904 has 20 divisors (see below), whose sum is σ = 1478146464. Its totient is φ = 286092768.

The previous prime is 667549871. The next prime is 667549919. The reversal of 667549904 is 409945766.

It is a Smith number, since the sum of its digits (50) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 2980022 + ... + 2980245.

Almost surely, 2^667549904 is an apocalyptic number.

It is an amenable number.

667549904 is an abundant number, since it is smaller than the sum of its proper divisors (810596560).

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

667549904 is a wasteful number, since it uses less digits than its factorization.

667549904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5960282 (or 5960276 counting only the distinct ones).

The product of its (nonzero) digits is 1632960, while the sum is 50.

The square root of 667549904 is about 25836.9871308556. The cubic root of 667549904 is about 873.9660839298.

The spelling of 667549904 in words is "six hundred sixty-seven million, five hundred forty-nine thousand, nine hundred four".