81288922 has 16 divisors (see below), whose sum is σ = 143250912. Its totient is φ = 34107120.

The previous prime is 81288901. The next prime is 81288929. The reversal of 81288922 is 22988218.

It is not an unprimeable number, because it can be changed into a prime (81288929) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 141828 + ... + 142399.

It is an arithmetic number, because the mean of its divisors is an integer number (8953182).

Almost surely, 2^81288922 is an apocalyptic number.

81288922 is a deficient number, since it is larger than the sum of its proper divisors (61961990).

81288922 is a wasteful number, since it uses less digits than its factorization.

81288922 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 284253.

The product of its digits is 36864, while the sum is 40.

The square root of 81288922 is about 9016.0369342633. The cubic root of 81288922 is about 433.1887021600.

The spelling of 81288922 in words is "eighty-one million, two hundred eighty-eight thousand, nine hundred twenty-two".