261960132 has 96 divisors (see below), whose sum is σ = 736646400. Its totient is φ = 70866432.

The previous prime is 261960113. The next prime is 261960221. The reversal of 261960132 is 231069162.

It is a super-2 number, since 2×261960132² = 137246221514914848, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 261960132.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 128094 + ... + 130122.

It is an arithmetic number, because the mean of its divisors is an integer number (7673400).

Almost surely, 2^261960132 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 261960132, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (368323200).

261960132 is an abundant number, since it is smaller than the sum of its proper divisors (474686268).

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

261960132 is a wasteful number, since it uses less digits than its factorization.

261960132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2125 (or 2123 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 30.

The square root of 261960132 is about 16185.1824827526. The cubic root of 261960132 is about 639.8503328409.

The spelling of 261960132 in words is "two hundred sixty-one million, nine hundred sixty thousand, one hundred thirty-two".