664348880 has 80 divisors (see below), whose sum is σ = 1674059520. Its totient is φ = 243730944.

The previous prime is 664348877. The next prime is 664348897. The reversal of 664348880 is 88843466.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 167561 + ... + 171479.

It is an arithmetic number, because the mean of its divisors is an integer number (20925744).

Almost surely, 2^664348880 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 664348880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (837029760).

664348880 is an abundant number, since it is smaller than the sum of its proper divisors (1009710640).

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

664348880 is a wasteful number, since it uses less digits than its factorization.

664348880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4108 (or 4102 counting only the distinct ones).

The product of its (nonzero) digits is 884736, while the sum is 47.

The square root of 664348880 is about 25774.9661493473. The cubic root of 664348880 is about 872.5669026401.

The spelling of 664348880 in words is "six hundred sixty-four million, three hundred forty-eight thousand, eight hundred eighty".