8205128 has 8 divisors (see below), whose sum is σ = 15384630. Its totient is φ = 4102560.

The previous prime is 8205121. The next prime is 8205137. The reversal of 8205128 is 8215028.

It can be written as a sum of positive squares in only one way, i.e., 8076964 + 128164 = 2842^2 + 358^2 .

It is a tau number, because it is divible by the number of its divisors (8).

8205128 is a modest number, since divided by 205128 gives 8 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 8205097 and 8205106.

It is not an unprimeable number, because it can be changed into a prime (8205121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 512813 + ... + 512828.

Almost surely, 2^8205128 is an apocalyptic number.

It is an amenable number.

8205128 is a deficient number, since it is larger than the sum of its proper divisors (7179502).

8205128 is a wasteful number, since it uses less digits than its factorization.

8205128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1025647 (or 1025643 counting only the distinct ones).

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

The square root of 8205128 is about 2864.4594603520. The cubic root of 8205128 is about 201.6949943890.

The spelling of 8205128 in words is "eight million, two hundred five thousand, one hundred twenty-eight".