81432230 has 32 divisors (see below), whose sum is σ = 162109728. Its totient is φ = 29203200.

The previous prime is 81432229. The next prime is 81432251. The reversal of 81432230 is 3223418.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 81432196 and 81432205.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2960 + ... + 13100.

It is an arithmetic number, because the mean of its divisors is an integer number (5065929).

Almost surely, 2^81432230 is an apocalyptic number.

81432230 is a deficient number, since it is larger than the sum of its proper divisors (80677498).

81432230 is a wasteful number, since it uses less digits than its factorization.

81432230 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10232.

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 81432230 is about 9023.9808288803. The cubic root of 81432230 is about 433.4431155118.

Adding to 81432230 its reverse (3223418), we get a palindrome (84655648).

The spelling of 81432230 in words is "eighty-one million, four hundred thirty-two thousand, two hundred thirty".