81452844 has 144 divisors (see below), whose sum is σ = 243102720. Its totient is φ = 23522400.

The previous prime is 81452843. The next prime is 81452857. The reversal of 81452844 is 44825418.

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 = 81452799 and 81452808.

It is not an unprimeable number, because it can be changed into a prime (81452843) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 300429 + ... + 300699.

Almost surely, 2^81452844 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 81452844, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (121551360).

81452844 is an abundant number, since it is smaller than the sum of its proper divisors (161649876).

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

81452844 is a wasteful number, since it uses less digits than its factorization.

81452844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 329 (or 310 counting only the distinct ones).

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

The square root of 81452844 is about 9025.1229354508. The cubic root of 81452844 is about 433.4796867914.

The spelling of 81452844 in words is "eighty-one million, four hundred fifty-two thousand, eight hundred forty-four".