81208266 has 32 divisors (see below), whose sum is σ = 169124928. Its totient is φ = 25971840.

The previous prime is 81208247. The next prime is 81208271. The reversal of 81208266 is 66280218.

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, 13701 + ... + 18711.

It is an arithmetic number, because the mean of its divisors is an integer number (5285154).

Almost surely, 2^81208266 is an apocalyptic number.

81208266 is an abundant number, since it is smaller than the sum of its proper divisors (87916662).

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

81208266 is a wasteful number, since it uses less digits than its factorization.

81208266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5126.

The product of its (nonzero) digits is 9216, while the sum is 33.

The square root of 81208266 is about 9011.5629055120. The cubic root of 81208266 is about 433.0453827949.

The spelling of 81208266 in words is "eighty-one million, two hundred eight thousand, two hundred sixty-six".