81283384 has 32 divisors (see below), whose sum is σ = 187578720. Its totient is φ = 32155776.

The previous prime is 81283369. The next prime is 81283393. The reversal of 81283384 is 48338218.

It is a congruent number.

It is an unprimeable number.

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, 55099 + ... + 56554.

It is an arithmetic number, because the mean of its divisors is an integer number (5861835).

Almost surely, 2^81283384 is an apocalyptic number.

It is an amenable number.

81283384 is an abundant number, since it is smaller than the sum of its proper divisors (106295336).

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

81283384 is a wasteful number, since it uses less digits than its factorization.

81283384 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111679 (or 111675 counting only the distinct ones).

The product of its digits is 36864, while the sum is 37.

The square root of 81283384 is about 9015.7298096161. The cubic root of 81283384 is about 433.1788646018.

The spelling of 81283384 in words is "eighty-one million, two hundred eighty-three thousand, three hundred eighty-four".