261845672 has 32 divisors (see below), whose sum is σ = 544384800. Its totient is φ = 117067200.

The previous prime is 261845659. The next prime is 261845677. The reversal of 261845672 is 276548162.

It is not an unprimeable number, because it can be changed into a prime (261845677) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19022 + ... + 29757.

It is an arithmetic number, because the mean of its divisors is an integer number (17012025).

Almost surely, 2^261845672 is an apocalyptic number.

261845672 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

261845672 is an abundant number, since it is smaller than the sum of its proper divisors (282539128).

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

261845672 is a wasteful number, since it uses less digits than its factorization.

261845672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48857 (or 48853 counting only the distinct ones).

The product of its digits is 161280, while the sum is 41.

The square root of 261845672 is about 16181.6461461744. The cubic root of 261845672 is about 639.7571278968.

The spelling of 261845672 in words is "two hundred sixty-one million, eight hundred forty-five thousand, six hundred seventy-two".