81627222 has 16 divisors (see below), whose sum is σ = 164168640. Its totient is φ = 27056712.

The previous prime is 81627181. The next prime is 81627241. The reversal of 81627222 is 22272618.

It is a self number, because there is not a number n which added to its sum of digits gives 81627222.

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 7 ways as a sum of consecutive naturals, for example, 36928 + ... + 39075.

It is an arithmetic number, because the mean of its divisors is an integer number (10260540).

Almost surely, 2^81627222 is an apocalyptic number.

81627222 is an abundant number, since it is smaller than the sum of its proper divisors (82541418).

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

81627222 is a wasteful number, since it uses less digits than its factorization.

81627222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76187.

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

The square root of 81627222 is about 9034.7784698907. The cubic root of 81627222 is about 433.7888040649.

The spelling of 81627222 in words is "eighty-one million, six hundred twenty-seven thousand, two hundred twenty-two".