81114440 has 32 divisors (see below), whose sum is σ = 199100160. Its totient is φ = 29496000.

The previous prime is 81114437. The next prime is 81114493. The reversal of 81114440 is 4441118.

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 7 ways as a sum of consecutive naturals, for example, 91736 + ... + 92615.

It is an arithmetic number, because the mean of its divisors is an integer number (6221880).

Almost surely, 2^81114440 is an apocalyptic number.

It is an amenable number.

81114440 is an abundant number, since it is smaller than the sum of its proper divisors (117985720).

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

81114440 is a wasteful number, since it uses less digits than its factorization.

81114440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 184373 (or 184369 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 23.

The square root of 81114440 is about 9006.3555337328. The cubic root of 81114440 is about 432.8785419213.

Adding to 81114440 its reverse (4441118), we get a palindrome (85555558).

It can be divided in two parts, 811 and 14440, that added together give a palindrome (15251).

The spelling of 81114440 in words is "eighty-one million, one hundred fourteen thousand, four hundred forty".