81323882 has 4 divisors (see below), whose sum is σ = 121985826. Its totient is φ = 40661940.

The previous prime is 81323873. The next prime is 81323899. The reversal of 81323882 is 28832318.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 42523441 + 38800441 = 6521^2 + 6229^2 .

It is a super-2 number, since 2×81323882² = 13227147567099848, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20330969 + ... + 20330972.

Almost surely, 2^81323882 is an apocalyptic number.

81323882 is a deficient number, since it is larger than the sum of its proper divisors (40661944).

81323882 is a wasteful number, since it uses less digits than its factorization.

81323882 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40661943.

The product of its digits is 18432, while the sum is 35.

The square root of 81323882 is about 9017.9754934242. The cubic root of 81323882 is about 433.2507938782.

The spelling of 81323882 in words is "eighty-one million, three hundred twenty-three thousand, eight hundred eighty-two".