128825 has 6 divisors (see below), whose sum is σ = 159774. Its totient is φ = 103040.

The previous prime is 128819. The next prime is 128831. The reversal of 128825 is 528821.

It is an interprime number because it is at equal distance from previous prime (128819) and next prime (128831).

It can be written as a sum of positive squares in 3 ways, for example, as 12544 + 116281 = 112^2 + 341^2 .

It is not a de Polignac number, because 128825 - 2⁶ = 128761 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 11.

It is a junction number, because it is equal to n+sod(n) for n = 128794 and 128803.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 128825.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2552 + ... + 2601.

It is an arithmetic number, because the mean of its divisors is an integer number (26629).

2¹²⁸⁸²⁵ is an apocalyptic number.

It is an amenable number.

128825 is a deficient number, since it is larger than the sum of its proper divisors (30949).

128825 is an equidigital number, since it uses as much as digits as its factorization.

128825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5163 (or 5158 counting only the distinct ones).

The product of its digits is 1280, while the sum is 26.

The square root of 128825 is about 358.9219970969. The cubic root of 128825 is about 50.5048846695.

The spelling of 128825 in words is "one hundred twenty-eight thousand, eight hundred twenty-five".