660753680 has 20 divisors (see below), whose sum is σ = 1536252492. Its totient is φ = 264301440.

The previous prime is 660753679. The next prime is 660753689. The reversal of 660753680 is 86357066.

It can be written as a sum of positive squares in 2 ways, for example, as 101525776 + 559227904 = 10076^2 + 23648^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is not an unprimeable number, because it can be changed into a prime (660753689) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4129631 + ... + 4129790.

Almost surely, 2^660753680 is an apocalyptic number.

It is an amenable number.

660753680 is an abundant number, since it is smaller than the sum of its proper divisors (875498812).

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

660753680 is a wasteful number, since it uses less digits than its factorization.

660753680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8259434 (or 8259428 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 41.

The square root of 660753680 is about 25705.1294491975. The cubic root of 660753680 is about 870.9900562285.

The spelling of 660753680 in words is "six hundred sixty million, seven hundred fifty-three thousand, six hundred eighty".