81875244 has 48 divisors (see below), whose sum is σ = 211962240. Its totient is φ = 24387840.

The previous prime is 81875243. The next prime is 81875263. The reversal of 81875244 is 44257818.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (81875243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2532 + ... + 13044.

It is an arithmetic number, because the mean of its divisors is an integer number (4415880).

Almost surely, 2^81875244 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 81875244, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (105981120).

81875244 is an abundant number, since it is smaller than the sum of its proper divisors (130086996).

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

81875244 is a wasteful number, since it uses less digits than its factorization.

81875244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10590 (or 10588 counting only the distinct ones).

The product of its digits is 71680, while the sum is 39.

The square root of 81875244 is about 9048.4940183436. The cubic root of 81875244 is about 434.2277114900.

It can be divided in two parts, 8187 and 5244, that added together give a palindrome (13431).

The spelling of 81875244 in words is "eighty-one million, eight hundred seventy-five thousand, two hundred forty-four".