660840752 has 80 divisors (see below), whose sum is σ = 1510236672. Its totient is φ = 276168960.

The previous prime is 660840751. The next prime is 660840773. The reversal of 660840752 is 257048066.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (660840751) by changing a digit.

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, 839303 + ... + 840089.

Almost surely, 2^660840752 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 660840752, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (755118336).

660840752 is an abundant number, since it is smaller than the sum of its proper divisors (849395920).

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

660840752 is a wasteful number, since it uses less digits than its factorization.

660840752 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1186 (or 1180 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 38.

The square root of 660840752 is about 25706.8230631480. The cubic root of 660840752 is about 871.0283133064.

The spelling of 660840752 in words is "six hundred sixty million, eight hundred forty thousand, seven hundred fifty-two".