81222888 has 16 divisors (see below), whose sum is σ = 203057280. Its totient is φ = 27074288.

The previous prime is 81222877. The next prime is 81222893. The reversal of 81222888 is 88822218.

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1692120 + ... + 1692167.

It is an arithmetic number, because the mean of its divisors is an integer number (12691080).

Almost surely, 2^81222888 is an apocalyptic number.

It is an amenable number.

81222888 is an abundant number, since it is smaller than the sum of its proper divisors (121834392).

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

81222888 is a wasteful number, since it uses less digits than its factorization.

81222888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3384296 (or 3384292 counting only the distinct ones).

The product of its digits is 32768, while the sum is 39.

The square root of 81222888 is about 9012.3741600091. The cubic root of 81222888 is about 433.0713719784.

The spelling of 81222888 in words is "eighty-one million, two hundred twenty-two thousand, eight hundred eighty-eight".