660320870 has 64 divisors (see below), whose sum is σ = 1401926400. Its totient is φ = 221304960.

The previous prime is 660320849. The next prime is 660320873. The reversal of 660320870 is 78023066.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660320873) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 73061 + ... + 81599.

It is an arithmetic number, because the mean of its divisors is an integer number (21905100).

Almost surely, 2^660320870 is an apocalyptic number.

660320870 is an abundant number, since it is smaller than the sum of its proper divisors (741605530).

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

660320870 is a wasteful number, since it uses less digits than its factorization.

660320870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8613.

The product of its (nonzero) digits is 12096, while the sum is 32.

The square root of 660320870 is about 25696.7093224016. The cubic root of 660320870 is about 870.7998413488.

The spelling of 660320870 in words is "six hundred sixty million, three hundred twenty thousand, eight hundred seventy".