261260610 has 64 divisors (see below), whose sum is σ = 691770240. Its totient is φ = 62737920.

The previous prime is 261260603. The next prime is 261260689. The reversal of 261260610 is 16062162.

261260610 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

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, 7821 + ... + 24159.

It is an arithmetic number, because the mean of its divisors is an integer number (10808910).

Almost surely, 2^261260610 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 261260610, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (345885120).

261260610 is an abundant number, since it is smaller than the sum of its proper divisors (430509630).

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

261260610 is a wasteful number, since it uses less digits than its factorization.

261260610 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16403.

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 261260610 is about 16163.5580860156. The cubic root of 261260610 is about 639.2802863251.

The spelling of 261260610 in words is "two hundred sixty-one million, two hundred sixty thousand, six hundred ten".