261444272 has 20 divisors (see below), whose sum is σ = 506928120. Its totient is φ = 130624128.

The previous prime is 261444247. The next prime is 261444319. The reversal of 261444272 is 272444162.

261444272 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19004 + ... + 29732.

It is an arithmetic number, because the mean of its divisors is an integer number (25346406).

Almost surely, 2^261444272 is an apocalyptic number.

It is an amenable number.

261444272 is a deficient number, since it is larger than the sum of its proper divisors (245483848).

261444272 is a wasteful number, since it uses less digits than its factorization.

261444272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12260 (or 12254 counting only the distinct ones).

The product of its digits is 21504, while the sum is 32.

The square root of 261444272 is about 16169.2384483624. The cubic root of 261444272 is about 639.4300524837.

The spelling of 261444272 in words is "two hundred sixty-one million, four hundred forty-four thousand, two hundred seventy-two".