668220400 has 30 divisors (see below), whose sum is σ = 1605400472. Its totient is φ = 267288000.

The previous prime is 668220391. The next prime is 668220401. The reversal of 668220400 is 4022866.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668220401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 834876 + ... + 835675.

Almost surely, 2^668220400 is an apocalyptic number.

It is an amenable number.

668220400 is an abundant number, since it is smaller than the sum of its proper divisors (937180072).

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

668220400 is a wasteful number, since it uses less digits than its factorization.

668220400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1670569 (or 1670558 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 28.

The square root of 668220400 is about 25849.9593810126. The cubic root of 668220400 is about 874.2585937367.

The spelling of 668220400 in words is "six hundred sixty-eight million, two hundred twenty thousand, four hundred".