660788064 has 96 divisors (see below), whose sum is σ = 1989550080. Its totient is φ = 213148800.

The previous prime is 660788053. The next prime is 660788083. The reversal of 660788064 is 460887066.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (96).

It is a congruent number.

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, 14449 + ... + 39119.

It is an arithmetic number, because the mean of its divisors is an integer number (20724480).

Almost surely, 2^660788064 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 660788064, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (994775040).

660788064 is an abundant number, since it is smaller than the sum of its proper divisors (1328762016).

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

660788064 is a wasteful number, since it uses less digits than its factorization.

660788064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24721 (or 24707 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 45.

The square root of 660788064 is about 25705.7982564246. The cubic root of 660788064 is about 871.0051640281.

The spelling of 660788064 in words is "six hundred sixty million, seven hundred eighty-eight thousand, sixty-four".