81223000 has 32 divisors (see below), whose sum is σ = 190064160. Its totient is φ = 32488800.

The previous prime is 81222983. The next prime is 81223031. The reversal of 81223000 is 32218.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39612 + ... + 41611.

It is an arithmetic number, because the mean of its divisors is an integer number (5939505).

Almost surely, 2^81223000 is an apocalyptic number.

It is an amenable number.

81223000 is an abundant number, since it is smaller than the sum of its proper divisors (108841160).

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

81223000 is a wasteful number, since it uses less digits than its factorization.

81223000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81244 (or 81230 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 81223000 is about 9012.3803736860. The cubic root of 81223000 is about 433.0715710355.

Adding to 81223000 its reverse (32218), we get a palindrome (81255218).

The spelling of 81223000 in words is "eighty-one million, two hundred twenty-three thousand".