128828423808 has 320 divisors, whose sum is σ = 448362150720. Its totient is φ = 35951247360.

The previous prime is 128828423803. The next prime is 128828423833. The reversal of 128828423808 is 808324828821.

128828423808 is a `hidden beast` number, since 1 + 288 + 284 + 2 + 3 + 80 + 8 = 666.

It is a super-2 number, since 2×128828423808² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (128828423803) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 3100128 + ... + 3141408.

It is an arithmetic number, because the mean of its divisors is an integer number (1401131721).

Almost surely, 2^128828423808 is an apocalyptic number.

128828423808 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 128828423808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (224181075360).

128828423808 is an abundant number, since it is smaller than the sum of its proper divisors (319533726912).

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

128828423808 is an equidigital number, since it uses as much as digits as its factorization.

128828423808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41357 (or 41336 counting only the distinct ones).

The product of its (nonzero) digits is 3145728, while the sum is 54.

The spelling of 128828423808 in words is "one hundred twenty-eight billion, eight hundred twenty-eight million, four hundred twenty-three thousand, eight hundred eight".