81834384 has 40 divisors (see below), whose sum is σ = 212074720. Its totient is φ = 27191808.

The previous prime is 81834383. The next prime is 81834397. The reversal of 81834384 is 48343818.

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (81834383) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13647 + ... + 18705.

It is an arithmetic number, because the mean of its divisors is an integer number (5301868).

Almost surely, 2^81834384 is an apocalyptic number.

It is an amenable number.

81834384 is an abundant number, since it is smaller than the sum of its proper divisors (130240336).

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

81834384 is a wasteful number, since it uses less digits than its factorization.

81834384 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5407 (or 5401 counting only the distinct ones).

The product of its digits is 73728, while the sum is 39.

The square root of 81834384 is about 9046.2359022966. The cubic root of 81834384 is about 434.1554654087.

The spelling of 81834384 in words is "eighty-one million, eight hundred thirty-four thousand, three hundred eighty-four".