261447216 has 40 divisors (see below), whose sum is σ = 715137264. Its totient is φ = 82022400.

The previous prime is 261447191. The next prime is 261447223. The reversal of 261447216 is 612744162.

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, 159385 + ... + 161016.

Almost surely, 2^261447216 is an apocalyptic number.

It is an amenable number.

261447216 is an abundant number, since it is smaller than the sum of its proper divisors (453690048).

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

261447216 is a wasteful number, since it uses less digits than its factorization.

261447216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 320429 (or 320423 counting only the distinct ones).

The product of its digits is 16128, while the sum is 33.

The square root of 261447216 is about 16169.3294851704. The cubic root of 261447216 is about 639.4324525810.

The spelling of 261447216 in words is "two hundred sixty-one million, four hundred forty-seven thousand, two hundred sixteen".