81222276 has 12 divisors (see below), whose sum is σ = 189518672. Its totient is φ = 27074088.

The previous prime is 81222259. The next prime is 81222299. The reversal of 81222276 is 67222218.

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

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, 3384250 + ... + 3384273.

Almost surely, 2^81222276 is an apocalyptic number.

It is an amenable number.

81222276 is an abundant number, since it is smaller than the sum of its proper divisors (108296396).

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

81222276 is a wasteful number, since it uses less digits than its factorization.

81222276 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6768530 (or 6768528 counting only the distinct ones).

The product of its digits is 5376, while the sum is 30.

The square root of 81222276 is about 9012.3402066278. The cubic root of 81222276 is about 433.0702842705.

The spelling of 81222276 in words is "eighty-one million, two hundred twenty-two thousand, two hundred seventy-six".