261472272 has 20 divisors (see below), whose sum is σ = 675470160. Its totient is φ = 87157408.

The previous prime is 261472271. The next prime is 261472279. The reversal of 261472272 is 272274162.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (261472271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2723622 + ... + 2723717.

It is an arithmetic number, because the mean of its divisors is an integer number (33773508).

Almost surely, 2^261472272 is an apocalyptic number.

It is an amenable number.

261472272 is an abundant number, since it is smaller than the sum of its proper divisors (413997888).

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

261472272 is a wasteful number, since it uses less digits than its factorization.

261472272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5447350 (or 5447344 counting only the distinct ones).

The product of its digits is 18816, while the sum is 33.

The square root of 261472272 is about 16170.1042668252. The cubic root of 261472272 is about 639.4528787661.

The spelling of 261472272 in words is "two hundred sixty-one million, four hundred seventy-two thousand, two hundred seventy-two".