81593232 has 120 divisors (see below), whose sum is σ = 248171616. Its totient is φ = 23030784.

The previous prime is 81593191. The next prime is 81593243. The reversal of 81593232 is 23239518.

Its product of digits (12960) is a multiple of the sum of its prime divisors (432).

It is a junction number, because it is equal to n+sod(n) for n = 81593193 and 81593202.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 265623 + ... + 265929.

Almost surely, 2^81593232 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81593232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (124085808).

81593232 is an abundant number, since it is smaller than the sum of its proper divisors (166578384).

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

81593232 is a wasteful number, since it uses less digits than its factorization.

81593232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 445 (or 432 counting only the distinct ones).

The product of its digits is 12960, while the sum is 33.

The square root of 81593232 is about 9032.8972096443. The cubic root of 81593232 is about 433.7285850672.

The spelling of 81593232 in words is "eighty-one million, five hundred ninety-three thousand, two hundred thirty-two".