261067272 has 32 divisors (see below), whose sum is σ = 661613280. Its totient is φ = 85829760.

The previous prime is 261067243. The next prime is 261067291. The reversal of 261067272 is 272760162.

It is a super-2 number, since 2×261067272² = 136312241019043968, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 72754 + ... + 76257.

It is an arithmetic number, because the mean of its divisors is an integer number (20675415).

Almost surely, 2^261067272 is an apocalyptic number.

It is an amenable number.

261067272 is an abundant number, since it is smaller than the sum of its proper divisors (400546008).

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

261067272 is a wasteful number, since it uses less digits than its factorization.

261067272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149093 (or 149089 counting only the distinct ones).

The product of its (nonzero) digits is 14112, while the sum is 33.

The square root of 261067272 is about 16157.5763033940. The cubic root of 261067272 is about 639.1225540737.

The spelling of 261067272 in words is "two hundred sixty-one million, sixty-seven thousand, two hundred seventy-two".