128504868 has 12 divisors (see below), whose sum is σ = 299844720. Its totient is φ = 42834952.

The previous prime is 128504867. The next prime is 128504869. The reversal of 128504868 is 868405821.

It is an interprime number because it is at equal distance from previous prime (128504867) and next prime (128504869).

It is a tau number, because it is divible by the number of its divisors (12).

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (128504863) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5354358 + ... + 5354381.

It is an arithmetic number, because the mean of its divisors is an integer number (24987060).

Almost surely, 2^128504868 is an apocalyptic number.

It is an amenable number.

128504868 is an abundant number, since it is smaller than the sum of its proper divisors (171339852).

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

128504868 is a wasteful number, since it uses less digits than its factorization.

128504868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10708746 (or 10708744 counting only the distinct ones).

The product of its (nonzero) digits is 122880, while the sum is 42.

The square root of 128504868 is about 11335.9987649964. The cubic root of 128504868 is about 504.6301484344.

The spelling of 128504868 in words is "one hundred twenty-eight million, five hundred four thousand, eight hundred sixty-eight".