81255672 has 48 divisors (see below), whose sum is σ = 222735240. Its totient is φ = 26756928.

The previous prime is 81255661. The next prime is 81255673. The reversal of 81255672 is 27655218.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81255673) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 823 + ... + 12774.

Almost surely, 2^81255672 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81255672, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (111367620).

81255672 is an abundant number, since it is smaller than the sum of its proper divisors (141479568).

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

81255672 is a wasteful number, since it uses less digits than its factorization.

81255672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13692 (or 13685 counting only the distinct ones).

The product of its digits is 33600, while the sum is 36.

The square root of 81255672 is about 9014.1928091205. The cubic root of 81255672 is about 433.1296310169.

The spelling of 81255672 in words is "eighty-one million, two hundred fifty-five thousand, six hundred seventy-two".