128243808 has 144 divisors (see below), whose sum is σ = 454761216. Its totient is φ = 33304320.

The previous prime is 128243789. The next prime is 128243827. The reversal of 128243808 is 808342821.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (128243789) and next prime (128243827).

It is a tau number, because it is divible by the number of its divisors (144).

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, 19285 + ... + 25067.

It is an arithmetic number, because the mean of its divisors is an integer number (3158064).

Almost surely, 2^128243808 is an apocalyptic number.

128243808 is a gapful number since it is divisible by the number (18) 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 128243808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (227380608).

128243808 is an abundant number, since it is smaller than the sum of its proper divisors (326517408).

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

128243808 is a wasteful number, since it uses less digits than its factorization.

128243808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5817 (or 5806 counting only the distinct ones).

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

The square root of 128243808 is about 11324.4782661278. The cubic root of 128243808 is about 504.2881949626.

The spelling of 128243808 in words is "one hundred twenty-eight million, two hundred forty-three thousand, eight hundred eight".