81673122 has 32 divisors (see below), whose sum is σ = 167443200. Its totient is φ = 26546048.

The previous prime is 81673121. The next prime is 81673133. The reversal of 81673122 is 22137618.

It is a self number, because there is not a number n which added to its sum of digits gives 81673122.

It is not an unprimeable number, because it can be changed into a prime (81673121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 143254 + ... + 143822.

It is an arithmetic number, because the mean of its divisors is an integer number (5232600).

Almost surely, 2^81673122 is an apocalyptic number.

81673122 is an abundant number, since it is smaller than the sum of its proper divisors (85770078).

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

81673122 is a wasteful number, since it uses less digits than its factorization.

81673122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1130.

The product of its digits is 4032, while the sum is 30.

The square root of 81673122 is about 9037.3182969286. The cubic root of 81673122 is about 433.8700971056.

The spelling of 81673122 in words is "eighty-one million, six hundred seventy-three thousand, one hundred twenty-two".