81789022 has 16 divisors (see below), whose sum is σ = 141498720. Its totient is φ = 34730208.

The previous prime is 81789011. The next prime is 81789031. The reversal of 81789022 is 22098718.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25273 + ... + 28324.

It is an arithmetic number, because the mean of its divisors is an integer number (8843670).

Almost surely, 2^81789022 is an apocalyptic number.

81789022 is a deficient number, since it is larger than the sum of its proper divisors (59709698).

81789022 is a wasteful number, since it uses less digits than its factorization.

81789022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53715.

The product of its (nonzero) digits is 16128, while the sum is 37.

The square root of 81789022 is about 9043.7283240929. The cubic root of 81789022 is about 434.0752309999.

The spelling of 81789022 in words is "eighty-one million, seven hundred eighty-nine thousand, twenty-two".