261060786 has 64 divisors (see below), whose sum is σ = 664934400. Its totient is φ = 74372688.

The previous prime is 261060749. The next prime is 261060803. The reversal of 261060786 is 687060162.

It is a happy number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 261060786.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 166675 + ... + 168233.

It is an arithmetic number, because the mean of its divisors is an integer number (10389600).

Almost surely, 2^261060786 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 261060786, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (332467200).

261060786 is an abundant number, since it is smaller than the sum of its proper divisors (403873614).

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

261060786 is a wasteful number, since it uses less digits than its factorization.

261060786 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2020 (or 2014 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 261060786 is about 16157.3755913515. The cubic root of 261060786 is about 639.1172612065.

The spelling of 261060786 in words is "two hundred sixty-one million, sixty thousand, seven hundred eighty-six".