82439808 has 128 divisors (see below), whose sum is σ = 247492800. Its totient is φ = 24084480.

The previous prime is 82439789. The next prime is 82439813. The reversal of 82439808 is 80893428.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (128).

It is a self number, because there is not a number n which added to its sum of digits gives 82439808.

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 15 ways as a sum of consecutive naturals, for example, 122160 + ... + 122832.

Almost surely, 2^82439808 is an apocalyptic number.

82439808 is a gapful number since it is divisible by the number (88) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 82439808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (123746400).

82439808 is an abundant number, since it is smaller than the sum of its proper divisors (165052992).

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

82439808 is a wasteful number, since it uses less digits than its factorization.

82439808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 730 (or 718 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 42.

The square root of 82439808 is about 9079.6369971492. The cubic root of 82439808 is about 435.2234866938.

The spelling of 82439808 in words is "eighty-two million, four hundred thirty-nine thousand, eight hundred eight".