81255432 has 32 divisors (see below), whose sum is σ = 203669280. Its totient is φ = 27014400.

The previous prime is 81255431. The next prime is 81255451. The reversal of 81255432 is 23455218.

It is a self number, because there is not a number n which added to its sum of digits gives 81255432.

It is not an unprimeable number, because it can be changed into a prime (81255431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5403 + ... + 13845.

It is an arithmetic number, because the mean of its divisors is an integer number (6364665).

Almost surely, 2^81255432 is an apocalyptic number.

It is an amenable number.

81255432 is an abundant number, since it is smaller than the sum of its proper divisors (122413848).

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

81255432 is a wasteful number, since it uses less digits than its factorization.

81255432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8853 (or 8849 counting only the distinct ones).

The product of its digits is 9600, while the sum is 30.

The square root of 81255432 is about 9014.1794967706. The cubic root of 81255432 is about 433.1292045801.

The spelling of 81255432 in words is "eighty-one million, two hundred fifty-five thousand, four hundred thirty-two".