261995344 has 20 divisors (see below), whose sum is σ = 546663796. Its totient is φ = 120920832.

The previous prime is 261995333. The next prime is 261995387. The reversal of 261995344 is 443599162.

It can be written as a sum of positive squares in 2 ways, for example, as 100400400 + 161594944 = 10020^2 + 12712^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 261995344.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 629589 + ... + 630004.

Almost surely, 2^261995344 is an apocalyptic number.

It is an amenable number.

261995344 is an abundant number, since it is smaller than the sum of its proper divisors (284668452).

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

261995344 is a wasteful number, since it uses less digits than its factorization.

261995344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1259614 (or 1259608 counting only the distinct ones).

The product of its digits is 233280, while the sum is 43.

The square root of 261995344 is about 16186.2702312793. The cubic root of 261995344 is about 639.8790005626.

The spelling of 261995344 in words is "two hundred sixty-one million, nine hundred ninety-five thousand, three hundred forty-four".