81022036 has 6 divisors (see below), whose sum is σ = 141788570. Its totient is φ = 40511016.

The previous prime is 81022033. The next prime is 81022037. The reversal of 81022036 is 63022018.

It can be written as a sum of positive squares in only one way, i.e., 63297936 + 17724100 = 7956^2 + 4210^2 .

It is a junction number, because it is equal to n+sod(n) for n = 81021998 and 81022016.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81022033) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10127751 + ... + 10127758.

Almost surely, 2^81022036 is an apocalyptic number.

It is an amenable number.

81022036 is a deficient number, since it is larger than the sum of its proper divisors (60766534).

81022036 is a wasteful number, since it uses less digits than its factorization.

81022036 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20255513 (or 20255511 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 81022036 is about 9001.2241389713. The cubic root of 81022036 is about 432.7141038452.

The spelling of 81022036 in words is "eighty-one million, twenty-two thousand, thirty-six".