81458224 has 20 divisors (see below), whose sum is σ = 157977736. Its totient is φ = 40689792.

The previous prime is 81458213. The next prime is 81458233. The reversal of 81458224 is 42285418.

It is a self number, because there is not a number n which added to its sum of digits gives 81458224.

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 3 ways as a sum of consecutive naturals, for example, 22012 + ... + 25444.

Almost surely, 2^81458224 is an apocalyptic number.

It is an amenable number.

81458224 is a deficient number, since it is larger than the sum of its proper divisors (76519512).

81458224 is a wasteful number, since it uses less digits than its factorization.

81458224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4924 (or 4918 counting only the distinct ones).

The product of its digits is 20480, while the sum is 34.

The square root of 81458224 is about 9025.4209874111. The cubic root of 81458224 is about 433.4892304294.

The spelling of 81458224 in words is "eighty-one million, four hundred fifty-eight thousand, two hundred twenty-four".