81223030 has 32 divisors (see below), whose sum is σ = 170247744. Its totient is φ = 27321216.

The previous prime is 81222983. The next prime is 81223031. The reversal of 81223030 is 3032218.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 81222989 and 81223007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81223031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7237 + ... + 14656.

It is an arithmetic number, because the mean of its divisors is an integer number (5320242).

Almost surely, 2^81223030 is an apocalyptic number.

81223030 is an abundant number, since it is smaller than the sum of its proper divisors (89024714).

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

81223030 is a wasteful number, since it uses less digits than its factorization.

81223030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21960.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 81223030 is about 9012.3820380630. The cubic root of 81223030 is about 433.0716243543.

Adding to 81223030 its reverse (3032218), we get a palindrome (84255248).

The spelling of 81223030 in words is "eighty-one million, two hundred twenty-three thousand, thirty".