668806800 has 60 divisors (see below), whose sum is σ = 2142414960. Its totient is φ = 178348160.

The previous prime is 668806799. The next prime is 668806807. The reversal of 668806800 is 8608866.

It is a tau number, because it is divible by the number of its divisors (60).

It is a hoax number, since the sum of its digits (42) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (668806807) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 277470 + ... + 279869.

It is an arithmetic number, because the mean of its divisors is an integer number (35706916).

Almost surely, 2^668806800 is an apocalyptic number.

668806800 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

668806800 is an abundant number, since it is smaller than the sum of its proper divisors (1473608160).

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

668806800 is a wasteful number, since it uses less digits than its factorization.

668806800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 557360 (or 557349 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 42.

The square root of 668806800 is about 25861.2992713050. The cubic root of 668806800 is about 874.5142555655.

The spelling of 668806800 in words is "six hundred sixty-eight million, eight hundred six thousand, eight hundred".