668799488 has 80 divisors (see below), whose sum is σ = 1536758784. Its totient is φ = 284835840.

The previous prime is 668799407. The next prime is 668799517. The reversal of 668799488 is 884997866.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 684056 + ... + 685032.

Almost surely, 2^668799488 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 668799488, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (768379392).

668799488 is an abundant number, since it is smaller than the sum of its proper divisors (867959296).

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

668799488 is an equidigital number, since it uses as much as digits as its factorization.

668799488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1193 (or 1177 counting only the distinct ones).

The product of its digits is 41803776, while the sum is 65.

The square root of 668799488 is about 25861.1579013779. The cubic root of 668799488 is about 874.5110685607.

It can be divided in two parts, 66879 and 9488, that added together give a palindrome (76367).

The spelling of 668799488 in words is "six hundred sixty-eight million, seven hundred ninety-nine thousand, four hundred eighty-eight".