81704266 has 12 divisors (see below), whose sum is σ = 142565778. Its totient is φ = 35016072.

The previous prime is 81704263. The next prime is 81704279. The reversal of 81704266 is 66240718.

It can be written as a sum of positive squares in only one way, i.e., 64240225 + 17464041 = 8015^2 + 4179^2 .

It is not an unprimeable number, because it can be changed into a prime (81704263) 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, 416761 + ... + 416956.

Almost surely, 2^81704266 is an apocalyptic number.

81704266 is a deficient number, since it is larger than the sum of its proper divisors (60861512).

81704266 is a wasteful number, since it uses less digits than its factorization.

81704266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 833733 (or 833726 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 34.

The square root of 81704266 is about 9039.0412102169. The cubic root of 81704266 is about 433.9252385964.

The spelling of 81704266 in words is "eighty-one million, seven hundred four thousand, two hundred sixty-six".