128863305 has 20 divisors (see below), whose sum is σ = 231000132. Its totient is φ = 68726880.

The previous prime is 128863297. The next prime is 128863309. The reversal of 128863305 is 503368821.

128863305 is a `hidden beast` number, since 12 + 8 + 8 + 633 + 0 + 5 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 49154121 + 79709184 = 7011^2 + 8928^2 .

It is not a de Polignac number, because 128863305 - 2³ = 128863297 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 128863305.

It is not an unprimeable number, because it can be changed into a prime (128863309) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 158686 + ... + 159495.

Almost surely, 2^128863305 is an apocalyptic number.

128863305 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

128863305 is a deficient number, since it is larger than the sum of its proper divisors (102136827).

128863305 is an equidigital number, since it uses as much as digits as its factorization.

128863305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 318198 (or 318189 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The square root of 128863305 is about 11351.7974347678. The cubic root of 128863305 is about 505.0988990371.

The spelling of 128863305 in words is "one hundred twenty-eight million, eight hundred sixty-three thousand, three hundred five".