81044856 has 48 divisors (see below), whose sum is σ = 220484160. Its totient is φ = 26893440.

The previous prime is 81044849. The next prime is 81044863. The reversal of 81044856 is 65844018.

It is an interprime number because it is at equal distance from previous prime (81044849) and next prime (81044863).

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

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 81044856.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 14361 + ... + 19191.

It is an arithmetic number, because the mean of its divisors is an integer number (4593420).

Almost surely, 2^81044856 is an apocalyptic number.

It is an amenable number.

81044856 is an abundant number, since it is smaller than the sum of its proper divisors (139439304).

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

81044856 is a wasteful number, since it uses less digits than its factorization.

81044856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5076 (or 5069 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 36.

The square root of 81044856 is about 9002.4916550919. The cubic root of 81044856 is about 432.7547249298.

The spelling of 81044856 in words is "eighty-one million, forty-four thousand, eight hundred fifty-six".