128394368 has 32 divisors (see below), whose sum is σ = 264613500. Its totient is φ = 61981696.

The previous prime is 128394367. The next prime is 128394377. The reversal of 128394368 is 863493821.

It can be written as a sum of positive squares in 2 ways, for example, as 111682624 + 16711744 = 10568^2 + 4088^2 .

It is a tau number, because it is divible by the number of its divisors (32).

It is a super-2 number, since 2×128394368² = 32970227468238848, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (128394361) 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 3 ways as a sum of consecutive naturals, for example, 13583 + ... + 21006.

Almost surely, 2^128394368 is an apocalyptic number.

It is an amenable number.

128394368 is an abundant number, since it is smaller than the sum of its proper divisors (136219132).

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

128394368 is an equidigital number, since it uses as much as digits as its factorization.

128394368 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34632 (or 34620 counting only the distinct ones).

The product of its digits is 248832, while the sum is 44.

The square root of 128394368 is about 11331.1238630597. The cubic root of 128394368 is about 504.4854648831.

The spelling of 128394368 in words is "one hundred twenty-eight million, three hundred ninety-four thousand, three hundred sixty-eight".