261144440 has 32 divisors (see below), whose sum is σ = 590636880. Its totient is φ = 103913472.

The previous prime is 261144427. The next prime is 261144473. The reversal of 261144440 is 44441162.

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 7 ways as a sum of consecutive naturals, for example, 9194 + ... + 24633.

Almost surely, 2^261144440 is an apocalyptic number.

261144440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

261144440 is an abundant number, since it is smaller than the sum of its proper divisors (329492440).

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

261144440 is a wasteful number, since it uses less digits than its factorization.

261144440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34031 (or 34027 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 26.

The square root of 261144440 is about 16159.9641088710. The cubic root of 261144440 is about 639.1855199014.

The spelling of 261144440 in words is "two hundred sixty-one million, one hundred forty-four thousand, four hundred forty".