660260440 has 32 divisors (see below), whose sum is σ = 1697813280. Its totient is φ = 226374912.

The previous prime is 660260437. The next prime is 660260509. The reversal of 660260440 is 44062066.

660260440 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a junction number, because it is equal to n+sod(n) for n = 660260399 and 660260408.

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, 1178757 + ... + 1179316.

It is an arithmetic number, because the mean of its divisors is an integer number (53056665).

Almost surely, 2^660260440 is an apocalyptic number.

It is an amenable number.

660260440 is an abundant number, since it is smaller than the sum of its proper divisors (1037552840).

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

660260440 is a wasteful number, since it uses less digits than its factorization.

660260440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2358091 (or 2358087 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 28.

The square root of 660260440 is about 25695.5334640089. The cubic root of 660260440 is about 870.7732764659.

The spelling of 660260440 in words is "six hundred sixty million, two hundred sixty thousand, four hundred forty".