660485720 has 32 divisors (see below), whose sum is σ = 1486825200. Its totient is φ = 264064128.

The previous prime is 660485711. The next prime is 660485729. The reversal of 660485720 is 27584066.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (660485711) and next prime (660485729).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660485729) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 152951 + ... + 157209.

Almost surely, 2^660485720 is an apocalyptic number.

It is an amenable number.

660485720 is an abundant number, since it is smaller than the sum of its proper divisors (826339480).

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

660485720 is a wasteful number, since it uses less digits than its factorization.

660485720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8147 (or 8143 counting only the distinct ones).

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

The square root of 660485720 is about 25699.9167313826. The cubic root of 660485720 is about 870.8723007728.

The spelling of 660485720 in words is "six hundred sixty million, four hundred eighty-five thousand, seven hundred twenty".