261030056 has 96 divisors (see below), whose sum is σ = 606981600. Its totient is φ = 104630400.

The previous prime is 261030043. The next prime is 261030071. The reversal of 261030056 is 650030162.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 752075 + ... + 752421.

It is an arithmetic number, because the mean of its divisors is an integer number (6322725).

Almost surely, 2^261030056 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 261030056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (303490800).

261030056 is an abundant number, since it is smaller than the sum of its proper divisors (345951544).

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

261030056 is a wasteful number, since it uses less digits than its factorization.

261030056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 487 (or 476 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 23.

The square root of 261030056 is about 16156.4246044724. The cubic root of 261030056 is about 639.0921829550.

The spelling of 261030056 in words is "two hundred sixty-one million, thirty thousand, fifty-six".