81254844 has 72 divisors (see below), whose sum is σ = 231329280. Its totient is φ = 23824800.

The previous prime is 81254827. The next prime is 81254851. The reversal of 81254844 is 44845218.

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

It is a junction number, because it is equal to n+sod(n) for n = 81254799 and 81254808.

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 8967 + ... + 15585.

Almost surely, 2^81254844 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 81254844, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (115664640).

81254844 is an abundant number, since it is smaller than the sum of its proper divisors (150074436).

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

81254844 is a wasteful number, since it uses less digits than its factorization.

81254844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6671 (or 6666 counting only the distinct ones).

The product of its digits is 40960, while the sum is 36.

The square root of 81254844 is about 9014.1468814303. The cubic root of 81254844 is about 433.1281598065.

The spelling of 81254844 in words is "eighty-one million, two hundred fifty-four thousand, eight hundred forty-four".