261272312 has 24 divisors (see below), whose sum is σ = 569867760. Its totient is φ = 111973680.

The previous prime is 261272299. The next prime is 261272327. The reversal of 261272312 is 213272162.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 332864 + ... + 333647.

It is an arithmetic number, because the mean of its divisors is an integer number (23744490).

Almost surely, 2^261272312 is an apocalyptic number.

It is an amenable number.

261272312 is an abundant number, since it is smaller than the sum of its proper divisors (308595448).

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

261272312 is a wasteful number, since it uses less digits than its factorization.

261272312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 666531 (or 666520 counting only the distinct ones).

The product of its digits is 2016, while the sum is 26.

The square root of 261272312 is about 16163.9200690922. The cubic root of 261272312 is about 639.2898307492.

The spelling of 261272312 in words is "two hundred sixty-one million, two hundred seventy-two thousand, three hundred twelve".