81193224 has 64 divisors (see below), whose sum is σ = 245635200. Its totient is φ = 21832704.

The previous prime is 81193223. The next prime is 81193261. The reversal of 81193224 is 42239118.

It is a junction number, because it is equal to n+sod(n) for n = 81193191 and 81193200.

It is not an unprimeable number, because it can be changed into a prime (81193223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11359 + ... + 17070.

It is an arithmetic number, because the mean of its divisors is an integer number (3838050).

Almost surely, 2^81193224 is an apocalyptic number.

81193224 is a gapful number since it is divisible by the number (84) formed by its first and last digit.

It is an amenable number.

81193224 is an abundant number, since it is smaller than the sum of its proper divisors (164441976).

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

81193224 is a wasteful number, since it uses less digits than its factorization.

81193224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28462 (or 28458 counting only the distinct ones).

The product of its digits is 3456, while the sum is 30.

The square root of 81193224 is about 9010.7282724539. The cubic root of 81193224 is about 433.0186438466.

The spelling of 81193224 in words is "eighty-one million, one hundred ninety-three thousand, two hundred twenty-four".