261534872 has 32 divisors (see below), whose sum is σ = 499046400. Its totient is φ = 128472864.

The previous prime is 261534853. The next prime is 261534899. The reversal of 261534872 is 278435162.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 142553 + ... + 144375.

It is an arithmetic number, because the mean of its divisors is an integer number (15595200).

Almost surely, 2^261534872 is an apocalyptic number.

It is an amenable number.

261534872 is a deficient number, since it is larger than the sum of its proper divisors (237511528).

261534872 is a wasteful number, since it uses less digits than its factorization.

261534872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2135 (or 2131 counting only the distinct ones).

The product of its digits is 80640, while the sum is 38.

The square root of 261534872 is about 16172.0398218654. The cubic root of 261534872 is about 639.5039059181.

The spelling of 261534872 in words is "two hundred sixty-one million, five hundred thirty-four thousand, eight hundred seventy-two".