81892212 has 24 divisors (see below), whose sum is σ = 191520000. Its totient is φ = 27234816.

The previous prime is 81892207. The next prime is 81892219. The reversal of 81892212 is 21229818.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81892219) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 2212 + ... + 12987.

It is an arithmetic number, because the mean of its divisors is an integer number (7980000).

Almost surely, 2^81892212 is an apocalyptic number.

It is an amenable number.

81892212 is an abundant number, since it is smaller than the sum of its proper divisors (109627788).

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

81892212 is a wasteful number, since it uses less digits than its factorization.

81892212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15655 (or 15653 counting only the distinct ones).

The product of its digits is 4608, while the sum is 33.

The square root of 81892212 is about 9049.4315843593. The cubic root of 81892212 is about 434.2577061767.

It can be divided in two parts, 8189 and 2212, that added together give a palindrome (10401).

The spelling of 81892212 in words is "eighty-one million, eight hundred ninety-two thousand, two hundred twelve".