81589432232 has 128 divisors (see below), whose sum is σ = 196589030400. Its totient is φ = 30820953600.

The previous prime is 81589432163. The next prime is 81589432241. The reversal of 81589432232 is 23223498518.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4106819 + ... + 4126637.

It is an arithmetic number, because the mean of its divisors is an integer number (1535851800).

Almost surely, 2^81589432232 is an apocalyptic number.

81589432232 is a gapful number since it is divisible by the number (82) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81589432232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (98294515200).

81589432232 is an abundant number, since it is smaller than the sum of its proper divisors (114999598168).

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

81589432232 is a wasteful number, since it uses less digits than its factorization.

81589432232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20047 (or 20043 counting only the distinct ones).

The product of its digits is 829440, while the sum is 47.

The spelling of 81589432232 in words is "eighty-one billion, five hundred eighty-nine million, four hundred thirty-two thousand, two hundred thirty-two".