8128505 has 32 divisors (see below), whose sum is σ = 12469248. Its totient is φ = 4939200.

The previous prime is 8128501. The next prime is 8128511. The reversal of 8128505 is 5058218.

It is not a de Polignac number, because 8128505 - 2² = 8128501 is a prime.

It is not an unprimeable number, because it can be changed into a prime (8128501) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 16310 + ... + 16800.

It is an arithmetic number, because the mean of its divisors is an integer number (389664).

Almost surely, 2^8128505 is an apocalyptic number.

It is an amenable number.

8128505 is a deficient number, since it is larger than the sum of its proper divisors (4340743).

8128505 is a wasteful number, since it uses less digits than its factorization.

8128505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 557.

The product of its (nonzero) digits is 3200, while the sum is 29.

The square root of 8128505 is about 2851.0533141280. The cubic root of 8128505 is about 201.0651917609.

The spelling of 8128505 in words is "eight million, one hundred twenty-eight thousand, five hundred five".