82561266 has 12 divisors (see below), whose sum is σ = 178882782. Its totient is φ = 27520416.

The previous prime is 82561261. The next prime is 82561267. The reversal of 82561266 is 66216528.

It can be written as a sum of positive squares in only one way, i.e., 75951225 + 6610041 = 8715^2 + 2571^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 82561266.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82561261) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2293351 + ... + 2293386.

Almost surely, 2^82561266 is an apocalyptic number.

82561266 is an abundant number, since it is smaller than the sum of its proper divisors (96321516).

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

82561266 is a wasteful number, since it uses less digits than its factorization.

82561266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4586745 (or 4586742 counting only the distinct ones).

The product of its digits is 34560, while the sum is 36.

The square root of 82561266 is about 9086.3230186913. The cubic root of 82561266 is about 435.4371190666.

The spelling of 82561266 in words is "eighty-two million, five hundred sixty-one thousand, two hundred sixty-six".