660638576 has 120 divisors (see below), whose sum is σ = 1458187920. Its totient is φ = 289536000.

The previous prime is 660638507. The next prime is 660638593. The reversal of 660638576 is 675836066.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 660638576.

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 23 ways as a sum of consecutive naturals, for example, 6540926 + ... + 6541026.

It is an arithmetic number, because the mean of its divisors is an integer number (12151566).

Almost surely, 2^660638576 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 660638576, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (729093960).

660638576 is an abundant number, since it is smaller than the sum of its proper divisors (797549344).

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

660638576 is a wasteful number, since it uses less digits than its factorization.

660638576 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 235 (or 216 counting only the distinct ones).

The product of its (nonzero) digits is 1088640, while the sum is 47.

The square root of 660638576 is about 25702.8904211180. The cubic root of 660638576 is about 870.9394774906.

The spelling of 660638576 in words is "six hundred sixty million, six hundred thirty-eight thousand, five hundred seventy-six".