261806268 has 24 divisors (see below), whose sum is σ = 613782400. Its totient is φ = 86854320.

The previous prime is 261806267. The next prime is 261806297. The reversal of 261806268 is 862608162.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261806267) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 49168 + ... + 54231.

Almost surely, 2^261806268 is an apocalyptic number.

It is an amenable number.

261806268 is an abundant number, since it is smaller than the sum of its proper divisors (351976132).

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

261806268 is a wasteful number, since it uses less digits than its factorization.

261806268 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103617 (or 103615 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 39.

The square root of 261806268 is about 16180.4285480948. The cubic root of 261806268 is about 639.7250348776.

The spelling of 261806268 in words is "two hundred sixty-one million, eight hundred six thousand, two hundred sixty-eight".