81839044 has 24 divisors (see below), whose sum is σ = 169323840. Its totient is φ = 33864096.

The previous prime is 81839041. The next prime is 81839047. The reversal of 81839044 is 44093818.

It is an interprime number because it is at equal distance from previous prime (81839041) and next prime (81839047).

It is a junction number, because it is equal to n+sod(n) for n = 81838994 and 81839012.

It is not an unprimeable number, because it can be changed into a prime (81839041) 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 7 ways as a sum of consecutive naturals, for example, 49582 + ... + 51205.

It is an arithmetic number, because the mean of its divisors is an integer number (7055160).

Almost surely, 2^81839044 is an apocalyptic number.

It is an amenable number.

81839044 is an abundant number, since it is smaller than the sum of its proper divisors (87484796).

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

81839044 is a wasteful number, since it uses less digits than its factorization.

81839044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100827 (or 100825 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 37.

The square root of 81839044 is about 9046.4934643209. The cubic root of 81839044 is about 434.1637061423.

The spelling of 81839044 in words is "eighty-one million, eight hundred thirty-nine thousand, forty-four".