81632230 has 16 divisors (see below), whose sum is σ = 150522624. Its totient is φ = 31856320.

The previous prime is 81632219. The next prime is 81632233. The reversal of 81632230 is 3223618.

It is a junction number, because it is equal to n+sod(n) for n = 81632195 and 81632204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81632233) 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 7 ways as a sum of consecutive naturals, for example, 99142 + ... + 99961.

It is an arithmetic number, because the mean of its divisors is an integer number (9407664).

Almost surely, 2^81632230 is an apocalyptic number.

81632230 is a deficient number, since it is larger than the sum of its proper divisors (68890394).

81632230 is a wasteful number, since it uses less digits than its factorization.

81632230 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199151.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 81632230 is about 9035.0556168736. The cubic root of 81632230 is about 433.7976751656.

Adding to 81632230 its reverse (3223618), we get a palindrome (84855848).

The spelling of 81632230 in words is "eighty-one million, six hundred thirty-two thousand, two hundred thirty".