81859232 has 48 divisors (see below), whose sum is σ = 198358272. Its totient is φ = 32382720.

The previous prime is 81859181. The next prime is 81859291. The reversal of 81859232 is 23295818.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11144 + ... + 16967.

It is an arithmetic number, because the mean of its divisors is an integer number (4132464).

Almost surely, 2^81859232 is an apocalyptic number.

It is an amenable number.

81859232 is an abundant number, since it is smaller than the sum of its proper divisors (116499040).

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

81859232 is a wasteful number, since it uses less digits than its factorization.

81859232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28141 (or 28133 counting only the distinct ones).

The product of its digits is 34560, while the sum is 38.

The square root of 81859232 is about 9047.6091869620. The cubic root of 81859232 is about 434.1994029436.

The spelling of 81859232 in words is "eighty-one million, eight hundred fifty-nine thousand, two hundred thirty-two".