81222612 has 24 divisors (see below), whose sum is σ = 189686112. Its totient is φ = 27050400.

The previous prime is 81222577. The next prime is 81222619. The reversal of 81222612 is 21622218.

It is a super-2 number, since 2×81222612² = 13194225400205088, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81222619) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16162 + ... + 20582.

It is an arithmetic number, because the mean of its divisors is an integer number (7903588).

Almost surely, 2^81222612 is an apocalyptic number.

It is an amenable number.

81222612 is an abundant number, since it is smaller than the sum of its proper divisors (108463500).

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

81222612 is a wasteful number, since it uses less digits than its factorization.

81222612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5959 (or 5957 counting only the distinct ones).

The product of its digits is 768, while the sum is 24.

The square root of 81222612 is about 9012.3588477157. The cubic root of 81222612 is about 433.0708814441.

The spelling of 81222612 in words is "eighty-one million, two hundred twenty-two thousand, six hundred twelve".