81883212 has 36 divisors (see below), whose sum is σ = 195275640. Its totient is φ = 26705024.

The previous prime is 81883201. The next prime is 81883261. The reversal of 81883212 is 21238818.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 24964 + ... + 28052.

Almost surely, 2^81883212 is an apocalyptic number.

It is an amenable number.

81883212 is an abundant number, since it is smaller than the sum of its proper divisors (113392428).

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

81883212 is a wasteful number, since it uses less digits than its factorization.

81883212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3190 (or 3141 counting only the distinct ones).

The product of its digits is 6144, while the sum is 33.

The square root of 81883212 is about 9048.9343018943. The cubic root of 81883212 is about 434.2417972054.

The spelling of 81883212 in words is "eighty-one million, eight hundred eighty-three thousand, two hundred twelve".