660610688 has 64 divisors (see below), whose sum is σ = 1346155200. Its totient is φ = 322848768.

The previous prime is 660610681. The next prime is 660610697. The reversal of 660610688 is 886016066.

It is a tau number, because it is divible by the number of its divisors (64).

It is not an unprimeable number, because it can be changed into a prime (660610681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1173095 + ... + 1173657.

It is an arithmetic number, because the mean of its divisors is an integer number (21033675).

Almost surely, 2^660610688 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 660610688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (673077600).

660610688 is an abundant number, since it is smaller than the sum of its proper divisors (685544512).

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

660610688 is a wasteful number, since it uses less digits than its factorization.

660610688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 769 (or 757 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 41.

The square root of 660610688 is about 25702.3479083137. The cubic root of 660610688 is about 870.9272221250.

The spelling of 660610688 in words is "six hundred sixty million, six hundred ten thousand, six hundred eighty-eight".