128279808 has 144 divisors (see below), whose sum is σ = 386397760. Its totient is φ = 41969664.

The previous prime is 128279803. The next prime is 128279819. The reversal of 128279808 is 808972821.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128279803) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 462966 + ... + 463242.

Almost surely, 2^128279808 is an apocalyptic number.

128279808 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 128279808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (193198880).

128279808 is an abundant number, since it is smaller than the sum of its proper divisors (258117952).

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

128279808 is an equidigital number, since it uses as much as digits as its factorization.

128279808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 369 (or 349 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 45.

The square root of 128279808 is about 11326.0676317952. The cubic root of 128279808 is about 504.3353776865.

It can be divided in two parts, 128 and 279808, that added together give a 7-th power (279936 = 6⁷).

The spelling of 128279808 in words is "one hundred twenty-eight million, two hundred seventy-nine thousand, eight hundred eight".