660040960 has 72 divisors (see below), whose sum is σ = 1619694216. Its totient is φ = 257556480.

The previous prime is 660040937. The next prime is 660040973. The reversal of 660040960 is 69040066.

It can be written as a sum of positive squares in 4 ways, for example, as 53699584 + 606341376 = 7328^2 + 24624^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46192 + ... + 58768.

It is an arithmetic number, because the mean of its divisors is an integer number (22495753).

Almost surely, 2^660040960 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 660040960, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (809847108).

660040960 is an abundant number, since it is smaller than the sum of its proper divisors (959653256).

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

660040960 is a wasteful number, since it uses less digits than its factorization.

660040960 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12639 (or 12625 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 31.

The square root of 660040960 is about 25691.2623278810. The cubic root of 660040960 is about 870.6767799484.

The spelling of 660040960 in words is "six hundred sixty million, forty thousand, nine hundred sixty".