261510260 has 48 divisors (see below), whose sum is σ = 602646912. Its totient is φ = 94531200.

The previous prime is 261510241. The next prime is 261510289. The reversal of 261510260 is 62015162.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34625 + ... + 41495.

It is an arithmetic number, because the mean of its divisors is an integer number (12555144).

Almost surely, 2^261510260 is an apocalyptic number.

261510260 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 261510260, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (301323456).

261510260 is an abundant number, since it is smaller than the sum of its proper divisors (341136652).

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

261510260 is a wasteful number, since it uses less digits than its factorization.

261510260 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7064 (or 7062 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 261510260 is about 16171.2788609930. The cubic root of 261510260 is about 639.4838449045.

It can be divided in two parts, 2615102 and 60, that added together give a palindrome (2615162).

The spelling of 261510260 in words is "two hundred sixty-one million, five hundred ten thousand, two hundred sixty".