81966264 has 16 divisors (see below), whose sum is σ = 204915720. Its totient is φ = 27322080.

The previous prime is 81966253. The next prime is 81966277. The reversal of 81966264 is 46266918.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1707607 + ... + 1707654.

Almost surely, 2^81966264 is an apocalyptic number.

It is an amenable number.

81966264 is an abundant number, since it is smaller than the sum of its proper divisors (122949456).

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

81966264 is a wasteful number, since it uses less digits than its factorization.

81966264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3415270 (or 3415266 counting only the distinct ones).

The product of its digits is 124416, while the sum is 42.

The square root of 81966264 is about 9053.5221875246. The cubic root of 81966264 is about 434.3885609623.

The spelling of 81966264 in words is "eighty-one million, nine hundred sixty-six thousand, two hundred sixty-four".