81020230 has 16 divisors (see below), whose sum is σ = 147891744. Its totient is φ = 31951360.

The previous prime is 81020227. The next prime is 81020231. The reversal of 81020230 is 3202018.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81020231) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 56347 + ... + 57766.

It is an arithmetic number, because the mean of its divisors is an integer number (9243234).

Almost surely, 2^81020230 is an apocalyptic number.

81020230 is a deficient number, since it is larger than the sum of its proper divisors (66871514).

81020230 is a wasteful number, since it uses less digits than its factorization.

81020230 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114191.

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

The square root of 81020230 is about 9001.1238187240. The cubic root of 81020230 is about 432.7108887220.

Adding to 81020230 its reverse (3202018), we get a palindrome (84222248).

The spelling of 81020230 in words is "eighty-one million, twenty thousand, two hundred thirty".