660720770 has 32 divisors (see below), whose sum is σ = 1250536320. Its totient is φ = 250856320.

The previous prime is 660720733. The next prime is 660720773. The reversal of 660720770 is 77027066.

It is a self number, because there is not a number n which added to its sum of digits gives 660720770.

It is not an unprimeable number, because it can be changed into a prime (660720773) 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, 19166 + ... + 41094.

It is an arithmetic number, because the mean of its divisors is an integer number (39079260).

Almost surely, 2^660720770 is an apocalyptic number.

660720770 is a deficient number, since it is larger than the sum of its proper divisors (589815550).

660720770 is a wasteful number, since it uses less digits than its factorization.

660720770 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22090.

The product of its (nonzero) digits is 24696, while the sum is 35.

The square root of 660720770 is about 25704.4892966190. The cubic root of 660720770 is about 870.9755955908.

The spelling of 660720770 in words is "six hundred sixty million, seven hundred twenty thousand, seven hundred seventy".