668625320 has 64 divisors (see below), whose sum is σ = 1651795200. Its totient is φ = 241562880.

The previous prime is 668625319. The next prime is 668625367. The reversal of 668625320 is 23526866.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 64241 + ... + 73919.

It is an arithmetic number, because the mean of its divisors is an integer number (25809300).

Almost surely, 2^668625320 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 668625320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (825897600).

668625320 is an abundant number, since it is smaller than the sum of its proper divisors (983169880).

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

668625320 is a wasteful number, since it uses less digits than its factorization.

668625320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9858 (or 9854 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 38.

The square root of 668625320 is about 25857.7903154929. The cubic root of 668625320 is about 874.4351489116.

The spelling of 668625320 in words is "six hundred sixty-eight million, six hundred twenty-five thousand, three hundred twenty".