668476764 has 18 divisors (see below), whose sum is σ = 1689760800. Its totient is φ = 222825576.

The previous prime is 668476759. The next prime is 668476769. The reversal of 668476764 is 467674866.

It is a happy number.

668476764 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (668476759) and next prime (668476769).

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×668476764² = 893722368015823392, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 668476764.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668476769) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9284364 + ... + 9284435.

It is an arithmetic number, because the mean of its divisors is an integer number (93875600).

Almost surely, 2^668476764 is an apocalyptic number.

It is an amenable number.

668476764 is an abundant number, since it is smaller than the sum of its proper divisors (1021284036).

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

668476764 is a wasteful number, since it uses less digits than its factorization.

668476764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18568809 (or 18568804 counting only the distinct ones).

The product of its digits is 8128512, while the sum is 54.

The square root of 668476764 is about 25854.9175980122. The cubic root of 668476764 is about 874.3703830874.

The spelling of 668476764 in words is "six hundred sixty-eight million, four hundred seventy-six thousand, seven hundred sixty-four".