261111672 has 48 divisors (see below), whose sum is σ = 713807640. Its totient is φ = 86221248.

The previous prime is 261111637. The next prime is 261111703. The reversal of 261111672 is 276111162.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9243 + ... + 24650.

Almost surely, 2^261111672 is an apocalyptic number.

It is an amenable number.

261111672 is an abundant number, since it is smaller than the sum of its proper divisors (452695968).

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

261111672 is a wasteful number, since it uses less digits than its factorization.

261111672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34012 (or 34005 counting only the distinct ones).

The product of its digits is 1008, while the sum is 27.

The square root of 261111672 is about 16158.9502134266. The cubic root of 261111672 is about 639.1587841133.

The spelling of 261111672 in words is "two hundred sixty-one million, one hundred eleven thousand, six hundred seventy-two".