81248838 has 24 divisors (see below), whose sum is σ = 178614744. Its totient is φ = 24620640.

The previous prime is 81248833. The next prime is 81248863. The reversal of 81248838 is 83884218.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 81248838.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81248833) 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 11 ways as a sum of consecutive naturals, for example, 55231 + ... + 56682.

It is an arithmetic number, because the mean of its divisors is an integer number (7442281).

Almost surely, 2^81248838 is an apocalyptic number.

81248838 is an abundant number, since it is smaller than the sum of its proper divisors (97365906).

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

81248838 is a wasteful number, since it uses less digits than its factorization.

81248838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111940 (or 111929 counting only the distinct ones).

The product of its digits is 98304, while the sum is 42.

The square root of 81248838 is about 9013.8137322667. The cubic root of 81248838 is about 433.1174879020.

The spelling of 81248838 in words is "eighty-one million, two hundred forty-eight thousand, eight hundred thirty-eight".