261287274 has 32 divisors (see below), whose sum is σ = 542790720. Its totient is φ = 83750912.

The previous prime is 261287269. The next prime is 261287293. The reversal of 261287274 is 472782162.

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 15 ways as a sum of consecutive naturals, for example, 41797 + ... + 47639.

It is an arithmetic number, because the mean of its divisors is an integer number (16962210).

Almost surely, 2^261287274 is an apocalyptic number.

261287274 is an abundant number, since it is smaller than the sum of its proper divisors (281503446).

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

261287274 is a wasteful number, since it uses less digits than its factorization.

261287274 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6134.

The product of its digits is 75264, while the sum is 39.

The square root of 261287274 is about 16164.3828833643. The cubic root of 261287274 is about 639.3020336903.

The spelling of 261287274 in words is "two hundred sixty-one million, two hundred eighty-seven thousand, two hundred seventy-four".