128816 has 20 divisors (see below), whose sum is σ = 255192. Its totient is φ = 62976.

The previous prime is 128813. The next prime is 128819. The reversal of 128816 is 618821.

It is an interprime number because it is at equal distance from previous prime (128813) and next prime (128819).

It is a nialpdrome in base 11.

It is a zygodrome in base 11.

It is not an unprimeable number, because it can be changed into a prime (128813) 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, 1280 + ... + 1376.

2¹²⁸⁸¹⁶ is an apocalyptic number.

128816 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

128816 is a deficient number, since it is larger than the sum of its proper divisors (126376).

128816 is an equidigital number, since it uses as much as digits as its factorization.

128816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188 (or 182 counting only the distinct ones).

The product of its digits is 768, while the sum is 26.

The square root of 128816 is about 358.9094593348. The cubic root of 128816 is about 50.5037085144.

The spelling of 128816 in words is "one hundred twenty-eight thousand, eight hundred sixteen".