81027432 has 32 divisors (see below), whose sum is σ = 225076800. Its totient is φ = 27009072.

The previous prime is 81027403. The next prime is 81027433. The reversal of 81027432 is 23472018.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 81027396 and 81027405.

It is not an unprimeable number, because it can be changed into a prime (81027433) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 187348 + ... + 187779.

It is an arithmetic number, because the mean of its divisors is an integer number (7033650).

Almost surely, 2^81027432 is an apocalyptic number.

It is an amenable number.

81027432 is an abundant number, since it is smaller than the sum of its proper divisors (144049368).

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

81027432 is a wasteful number, since it uses less digits than its factorization.

81027432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 375142 (or 375132 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 81027432 is about 9001.5238709898. The cubic root of 81027432 is about 432.7237097647.

The spelling of 81027432 in words is "eighty-one million, twenty-seven thousand, four hundred thirty-two".