81434322 has 30 divisors (see below), whose sum is σ = 182730933. Its totient is φ = 27106488.

The previous prime is 81434321. The next prime is 81434333. The reversal of 81434322 is 22343418.

It can be written as a sum of positive squares in 2 ways, for example, as 68409441 + 13024881 = 8271^2 + 3609^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=6381.

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

It is not an unprimeable number, because it can be changed into a prime (81434321) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 114504 + ... + 115212.

Almost surely, 2^81434322 is an apocalyptic number.

81434322 is an abundant number, since it is smaller than the sum of its proper divisors (101296611).

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

81434322 is an frugal number, since it uses more digits than its factorization.

81434322 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1432 (or 714 counting only the distinct ones).

The product of its digits is 4608, while the sum is 27.

The square root of 81434322 is about 9024.0967415027. The cubic root of 81434322 is about 433.4468272086.

Multiplying 81434322 by its product of digits (4608), we get a square (375249355776 = 612576²).

The spelling of 81434322 in words is "eighty-one million, four hundred thirty-four thousand, three hundred twenty-two".