660931960 has 48 divisors (see below), whose sum is σ = 1610304840. Its totient is φ = 244033920.

The previous prime is 660931949. The next prime is 660931961. The reversal of 660931960 is 69139066.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660931961) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 42126 + ... + 55645.

Almost surely, 2^660931960 is an apocalyptic number.

It is an amenable number.

660931960 is an abundant number, since it is smaller than the sum of its proper divisors (949372880).

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

660931960 is a wasteful number, since it uses less digits than its factorization.

660931960 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97808 (or 97791 counting only the distinct ones).

The product of its (nonzero) digits is 52488, while the sum is 40.

The square root of 660931960 is about 25708.5970056711. The cubic root of 660931960 is about 871.0683840272.

The spelling of 660931960 in words is "six hundred sixty million, nine hundred thirty-one thousand, nine hundred sixty".