668963800 has 24 divisors (see below), whose sum is σ = 1555341300. Its totient is φ = 267585440.

The previous prime is 668963791. The next prime is 668963807. The reversal of 668963800 is 8369866.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668963807) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1672210 + ... + 1672609.

Almost surely, 2^668963800 is an apocalyptic number.

It is an amenable number.

668963800 is an abundant number, since it is smaller than the sum of its proper divisors (886377500).

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

668963800 is a wasteful number, since it uses less digits than its factorization.

668963800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3344835 (or 3344826 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 46.

The square root of 668963800 is about 25864.3345168593. The cubic root of 668963800 is about 874.5826799077.

The spelling of 668963800 in words is "six hundred sixty-eight million, nine hundred sixty-three thousand, eight hundred".