81423284 has 12 divisors (see below), whose sum is σ = 149990400. Its totient is φ = 38568888.

The previous prime is 81423283. The next prime is 81423299. The reversal of 81423284 is 48232418.

It is a self number, because there is not a number n which added to its sum of digits gives 81423284.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81423283) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 535604 + ... + 535755.

It is an arithmetic number, because the mean of its divisors is an integer number (12499200).

Almost surely, 2^81423284 is an apocalyptic number.

It is an amenable number.

81423284 is a deficient number, since it is larger than the sum of its proper divisors (68567116).

81423284 is a wasteful number, since it uses less digits than its factorization.

81423284 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1071382 (or 1071380 counting only the distinct ones).

The product of its digits is 12288, while the sum is 32.

The square root of 81423284 is about 9023.4851360214. The cubic root of 81423284 is about 433.4272425005.

The spelling of 81423284 in words is "eighty-one million, four hundred twenty-three thousand, two hundred eighty-four".