261172884 has 48 divisors (see below), whose sum is σ = 712667648. Its totient is φ = 72884448.

The previous prime is 261172883. The next prime is 261172913. The reversal of 261172884 is 488271162.

It is a happy number.

261172884 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×261172884² = 136422550673754912, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261172883) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32542 + ... + 39765.

Almost surely, 2^261172884 is an apocalyptic number.

It is an amenable number.

261172884 is an abundant number, since it is smaller than the sum of its proper divisors (451494764).

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

261172884 is a wasteful number, since it uses less digits than its factorization.

261172884 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72364 (or 72362 counting only the distinct ones).

The product of its digits is 43008, while the sum is 39.

The square root of 261172884 is about 16160.8441611198. The cubic root of 261172884 is about 639.2087258749.

The spelling of 261172884 in words is "two hundred sixty-one million, one hundred seventy-two thousand, eight hundred eighty-four".