660944256 has 128 divisors (see below), whose sum is σ = 2022831360. Its totient is φ = 187299840.

The previous prime is 660944239. The next prime is 660944267. The reversal of 660944256 is 652449066.

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 351190 + ... + 353066.

It is an arithmetic number, because the mean of its divisors is an integer number (15803370).

Almost surely, 2^660944256 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 660944256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1011415680).

660944256 is an abundant number, since it is smaller than the sum of its proper divisors (1361887104).

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

660944256 is a wasteful number, since it uses less digits than its factorization.

660944256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2032 (or 2020 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 42.

The square root of 660944256 is about 25708.8361463525. The cubic root of 660944256 is about 871.0737857887.

The spelling of 660944256 in words is "six hundred sixty million, nine hundred forty-four thousand, two hundred fifty-six".