259144640 has 28 divisors (see below), whose sum is σ = 617088936. Its totient is φ = 103657728.

The previous prime is 259144637. The next prime is 259144673. The reversal of 259144640 is 46441952.

It is a self number, because there is not a number n which added to its sum of digits gives 259144640.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 404594 + ... + 405233.

Almost surely, 2^259144640 is an apocalyptic number.

259144640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

259144640 is an abundant number, since it is smaller than the sum of its proper divisors (357944296).

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

259144640 is an equidigital number, since it uses as much as digits as its factorization.

259144640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 809844 (or 809834 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 35.

The square root of 259144640 is about 16097.9700583645. The cubic root of 259144640 is about 637.5497457016.

The spelling of 259144640 in words is "two hundred fifty-nine million, one hundred forty-four thousand, six hundred forty".