81443032 has 32 divisors (see below), whose sum is σ = 170470080. Its totient is φ = 36156960.

The previous prime is 81443029. The next prime is 81443051. The reversal of 81443032 is 23034418.

It is a super-2 number, since 2×81443032² = 13265934922706048, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 81442988 and 81443006.

It is a congruent number.

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, 6978 + ... + 14545.

It is an arithmetic number, because the mean of its divisors is an integer number (5327190).

Almost surely, 2^81443032 is an apocalyptic number.

It is an amenable number.

81443032 is an abundant number, since it is smaller than the sum of its proper divisors (89027048).

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

81443032 is a wasteful number, since it uses less digits than its factorization.

81443032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21583 (or 21579 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 25.

The square root of 81443032 is about 9024.5793253758. The cubic root of 81443032 is about 433.4622801003.

The spelling of 81443032 in words is "eighty-one million, four hundred forty-three thousand, thirty-two".