81453222 has 32 divisors (see below), whose sum is σ = 191656800. Its totient is φ = 25553664.

The previous prime is 81453191. The next prime is 81453227. The reversal of 81453222 is 22235418.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81453227) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 43447 + ... + 45282.

It is an arithmetic number, because the mean of its divisors is an integer number (5989275).

Almost surely, 2^81453222 is an apocalyptic number.

81453222 is an abundant number, since it is smaller than the sum of its proper divisors (110203578).

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

81453222 is a wasteful number, since it uses less digits than its factorization.

81453222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88757 (or 88751 counting only the distinct ones).

The product of its digits is 3840, while the sum is 27.

The square root of 81453222 is about 9025.1438769695. The cubic root of 81453222 is about 433.4803573432.

The spelling of 81453222 in words is "eighty-one million, four hundred fifty-three thousand, two hundred twenty-two".