660001264 has 80 divisors (see below), whose sum is σ = 1424908800. Its totient is φ = 294174720.

The previous prime is 660001193. The next prime is 660001283. The reversal of 660001264 is 462100066.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1469712 + ... + 1470160.

It is an arithmetic number, because the mean of its divisors is an integer number (17811360).

Almost surely, 2^660001264 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 660001264, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (712454400).

660001264 is an abundant number, since it is smaller than the sum of its proper divisors (764907536).

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

660001264 is a wasteful number, since it uses less digits than its factorization.

660001264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 698 (or 692 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 660001264 is about 25690.4897578851. The cubic root of 660001264 is about 870.6593249315.

The spelling of 660001264 in words is "six hundred sixty million, one thousand, two hundred sixty-four".