81284484 has 24 divisors (see below), whose sum is σ = 197910720. Its totient is φ = 25916704.

The previous prime is 81284471. The next prime is 81284503. The reversal of 81284484 is 48448218.

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

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, 146979 + ... + 147530.

It is an arithmetic number, because the mean of its divisors is an integer number (8246280).

Almost surely, 2^81284484 is an apocalyptic number.

It is an amenable number.

81284484 is an abundant number, since it is smaller than the sum of its proper divisors (116626236).

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

81284484 is a wasteful number, since it uses less digits than its factorization.

81284484 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 294539 (or 294537 counting only the distinct ones).

The product of its digits is 65536, while the sum is 39.

The square root of 81284484 is about 9015.7908138998. The cubic root of 81284484 is about 433.1808186485.

The spelling of 81284484 in words is "eighty-one million, two hundred eighty-four thousand, four hundred eighty-four".