81022436 has 24 divisors (see below), whose sum is σ = 154992096. Its totient is φ = 36753920.

The previous prime is 81022427. The next prime is 81022453. The reversal of 81022436 is 63422018.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24260 + ... + 27396.

It is an arithmetic number, because the mean of its divisors is an integer number (6458004).

Almost surely, 2^81022436 is an apocalyptic number.

It is an amenable number.

81022436 is a deficient number, since it is larger than the sum of its proper divisors (73969660).

81022436 is a wasteful number, since it uses less digits than its factorization.

81022436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3739 (or 3737 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 81022436 is about 9001.2463581440. The cubic root of 81022436 is about 432.7148159369.

The spelling of 81022436 in words is "eighty-one million, twenty-two thousand, four hundred thirty-six".