81223364 has 12 divisors (see below), whose sum is σ = 142243500. Its totient is φ = 40582368.

The previous prime is 81223333. The next prime is 81223367. The reversal of 81223364 is 46332218.

It can be written as a sum of positive squares in 2 ways, for example, as 29268100 + 51955264 = 5410^2 + 7208^2 .

It is not an unprimeable number, because it can be changed into a prime (81223367) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 359 + ... + 12750.

It is an arithmetic number, because the mean of its divisors is an integer number (11853625).

Almost surely, 2^81223364 is an apocalyptic number.

It is an amenable number.

81223364 is a deficient number, since it is larger than the sum of its proper divisors (61020136).

81223364 is a wasteful number, since it uses less digits than its factorization.

81223364 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14662 (or 14660 counting only the distinct ones).

The product of its digits is 6912, while the sum is 29.

The square root of 81223364 is about 9012.4005681061. The cubic root of 81223364 is about 433.0722179697.

The spelling of 81223364 in words is "eighty-one million, two hundred twenty-three thousand, three hundred sixty-four".