81266676 has 12 divisors (see below), whose sum is σ = 189622272. Its totient is φ = 27088888.

The previous prime is 81266657. The next prime is 81266677. The reversal of 81266676 is 67666218.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81266677) by changing a digit.

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, 3386100 + ... + 3386123.

It is an arithmetic number, because the mean of its divisors is an integer number (15801856).

Almost surely, 2^81266676 is an apocalyptic number.

It is an amenable number.

81266676 is an abundant number, since it is smaller than the sum of its proper divisors (108355596).

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

81266676 is a wasteful number, since it uses less digits than its factorization.

81266676 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6772230 (or 6772228 counting only the distinct ones).

The product of its digits is 145152, while the sum is 42.

The square root of 81266676 is about 9014.8031592487. The cubic root of 81266676 is about 433.1491822400.

The spelling of 81266676 in words is "eighty-one million, two hundred sixty-six thousand, six hundred seventy-six".