660896780 has 24 divisors (see below), whose sum is σ = 1390109280. Its totient is φ = 263934720.

The previous prime is 660896773. The next prime is 660896807. The reversal of 660896780 is 87698066.

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, 13565 + ... + 38804.

It is an arithmetic number, because the mean of its divisors is an integer number (57921220).

Almost surely, 2^660896780 is an apocalyptic number.

It is an amenable number.

660896780 is an abundant number, since it is smaller than the sum of its proper divisors (729212500).

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

660896780 is a wasteful number, since it uses less digits than its factorization.

660896780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53009 (or 53007 counting only the distinct ones).

The product of its (nonzero) digits is 870912, while the sum is 50.

The square root of 660896780 is about 25707.9127896451. The cubic root of 660896780 is about 871.0529287149.

The spelling of 660896780 in words is "six hundred sixty million, eight hundred ninety-six thousand, seven hundred eighty".