81095256 has 160 divisors (see below), whose sum is σ = 256481280. Its totient is φ = 23716800.

The previous prime is 81095251. The next prime is 81095269. The reversal of 81095256 is 65259018.

It is a happy number.

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

It is a self number, because there is not a number n which added to its sum of digits gives 81095256.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81095251) 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 39 ways as a sum of consecutive naturals, for example, 220785 + ... + 221151.

It is an arithmetic number, because the mean of its divisors is an integer number (1603008).

Almost surely, 2^81095256 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 81095256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (128240640).

81095256 is an abundant number, since it is smaller than the sum of its proper divisors (175386024).

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

81095256 is a wasteful number, since it uses less digits than its factorization.

81095256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 427 (or 414 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 36.

The square root of 81095256 is about 9005.2904450662. The cubic root of 81095256 is about 432.8444131985.

The spelling of 81095256 in words is "eighty-one million, ninety-five thousand, two hundred fifty-six".