660339680 has 576 divisors, whose sum is σ = 2316625920. Its totient is φ = 174182400.

The previous prime is 660339679. The next prime is 660339697. The reversal of 660339680 is 86933066.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 21301265 + ... + 21301295.

It is an arithmetic number, because the mean of its divisors is an integer number (4021920).

Almost surely, 2^660339680 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 660339680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1158312960).

660339680 is an abundant number, since it is smaller than the sum of its proper divisors (1656286240).

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

660339680 is a wasteful number, since it uses less digits than its factorization.

660339680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103 (or 88 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 41.

The square root of 660339680 is about 25697.0753199659. The cubic root of 660339680 is about 870.8081098489.

The spelling of 660339680 in words is "six hundred sixty million, three hundred thirty-nine thousand, six hundred eighty".