660893660 has 96 divisors (see below), whose sum is σ = 1632863232. Its totient is φ = 219985920.

The previous prime is 660893647. The next prime is 660893671. The reversal of 660893660 is 66398066.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1872044 + ... + 1872396.

It is an arithmetic number, because the mean of its divisors is an integer number (17008992).

Almost surely, 2^660893660 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 660893660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (816431616).

660893660 is an abundant number, since it is smaller than the sum of its proper divisors (971969572).

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

660893660 is a wasteful number, since it uses less digits than its factorization.

660893660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 723 (or 721 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 44.

The square root of 660893660 is about 25707.8521078677. The cubic root of 660893660 is about 871.0515580070.

The spelling of 660893660 in words is "six hundred sixty million, eight hundred ninety-three thousand, six hundred sixty".