260387280 has 60 divisors (see below), whose sum is σ = 874469700. Its totient is φ = 69436416.

The previous prime is 260387261. The next prime is 260387291. The reversal of 260387280 is 82783062.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 169833024 + 90554256 = 13032^2 + 9516^2 .

It is a tau number, because it is divible by the number of its divisors (60).

It is a Harshad number since it is a multiple of its sum of digits (36).

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 11 ways as a sum of consecutive naturals, for example, 180105 + ... + 181544.

It is an arithmetic number, because the mean of its divisors is an integer number (14574495).

Almost surely, 2^260387280 is an apocalyptic number.

260387280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

260387280 is an abundant number, since it is smaller than the sum of its proper divisors (614082420).

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

260387280 is a wasteful number, since it uses less digits than its factorization.

260387280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 361668 (or 361659 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 36.

The square root of 260387280 is about 16136.5200709447. The cubic root of 260387280 is about 638.5671721925.

The spelling of 260387280 in words is "two hundred sixty million, three hundred eighty-seven thousand, two hundred eighty".