81624822 has 32 divisors (see below), whose sum is σ = 165784320. Its totient is φ = 26789280.

The previous prime is 81624811. The next prime is 81624857. The reversal of 81624822 is 22842618.

It is a happy number.

It is a super-2 number, since 2×81624822² = 13325223133063368, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 165997 + ... + 166487.

It is an arithmetic number, because the mean of its divisors is an integer number (5180760).

Almost surely, 2^81624822 is an apocalyptic number.

81624822 is an abundant number, since it is smaller than the sum of its proper divisors (84159498).

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

81624822 is a wasteful number, since it uses less digits than its factorization.

81624822 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 868.

The product of its digits is 12288, while the sum is 33.

The square root of 81624822 is about 9034.6456488343. The cubic root of 81624822 is about 433.7845526102.

The spelling of 81624822 in words is "eighty-one million, six hundred twenty-four thousand, eight hundred twenty-two".