261436056 has 64 divisors (see below), whose sum is σ = 756000000. Its totient is φ = 73792128.

The previous prime is 261436039. The next prime is 261436061. The reversal of 261436056 is 650634162.

261436056 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×261436056² = 136697622753670272, which contains 22 as substring.

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, 4570 + ... + 23318.

It is an arithmetic number, because the mean of its divisors is an integer number (11812500).

Almost surely, 2^261436056 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 261436056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (378000000).

261436056 is an abundant number, since it is smaller than the sum of its proper divisors (494563944).

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

261436056 is a wasteful number, since it uses less digits than its factorization.

261436056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18848 (or 18844 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 33.

The square root of 261436056 is about 16168.9843836897. The cubic root of 261436056 is about 639.4233542910.

The spelling of 261436056 in words is "two hundred sixty-one million, four hundred thirty-six thousand, fifty-six".