84431808 has 168 divisors, whose sum is σ = 257952240. Its totient is φ = 27371520.

The previous prime is 84431791. The next prime is 84431821. The reversal of 84431808 is 80813448.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 948628 + ... + 948716.

It is an arithmetic number, because the mean of its divisors is an integer number (1535430).

Almost surely, 2^84431808 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 84431808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (128976120).

84431808 is an abundant number, since it is smaller than the sum of its proper divisors (173520432).

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

84431808 is an equidigital number, since it uses as much as digits as its factorization.

84431808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 177 (or 155 counting only the distinct ones).

The product of its (nonzero) digits is 24576, while the sum is 36.

The square root of 84431808 is about 9188.6782509782. The cubic root of 84431808 is about 438.7010727821.

The spelling of 84431808 in words is "eighty-four million, four hundred thirty-one thousand, eight hundred eight".