261025056 has 72 divisors (see below), whose sum is σ = 767910780. Its totient is φ = 84005376.

The previous prime is 261025049. The next prime is 261025057. The reversal of 261025056 is 650520162.

It can be written as a sum of positive squares in 2 ways, for example, as 259725456 + 1299600 = 16116^2 + 1140^2 .

It is a tau number, because it is divible by the number of its divisors (72).

It is not an unprimeable number, because it can be changed into a prime (261025057) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7275 + ... + 23978.

Almost surely, 2^261025056 is an apocalyptic number.

It is an amenable number.

261025056 is an abundant number, since it is smaller than the sum of its proper divisors (506885724).

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

261025056 is a wasteful number, since it uses less digits than its factorization.

261025056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31298 (or 31287 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 261025056 is about 16156.2698665255. The cubic root of 261025056 is about 639.0881023505.

The spelling of 261025056 in words is "two hundred sixty-one million, twenty-five thousand, fifty-six".