261022410 has 96 divisors (see below), whose sum is σ = 746815680. Its totient is φ = 63249120.

The previous prime is 261022393. The next prime is 261022451. The reversal of 261022410 is 14220162.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 118701 + ... + 120879.

It is an arithmetic number, because the mean of its divisors is an integer number (7779330).

Almost surely, 2^261022410 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 261022410, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (373407840).

261022410 is an abundant number, since it is smaller than the sum of its proper divisors (485793270).

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

261022410 is a wasteful number, since it uses less digits than its factorization.

261022410 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2225 (or 2200 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 261022410 is about 16156.1879786044. The cubic root of 261022410 is about 639.0859428734.

Adding to 261022410 its reverse (14220162), we get a palindrome (275242572).

The spelling of 261022410 in words is "two hundred sixty-one million, twenty-two thousand, four hundred ten".