664319880 has 320 divisors, whose sum is σ = 2703507840. Its totient is φ = 142829568.

The previous prime is 664319869. The next prime is 664319893. The reversal of 664319880 is 88913466.

664319880 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 384699 + ... + 386421.

It is an arithmetic number, because the mean of its divisors is an integer number (8448462).

Almost surely, 2^664319880 is an apocalyptic number.

664319880 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 664319880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1351753920).

664319880 is an abundant number, since it is smaller than the sum of its proper divisors (2039187960).

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

664319880 is a wasteful number, since it uses less digits than its factorization.

664319880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1770 (or 1757 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 45.

The square root of 664319880 is about 25774.4035818484. The cubic root of 664319880 is about 872.5542060941.

The spelling of 664319880 in words is "six hundred sixty-four million, three hundred nineteen thousand, eight hundred eighty".