8280505 has 4 divisors (see below), whose sum is σ = 9936612. Its totient is φ = 6624400.

The previous prime is 8280499. The next prime is 8280509. The reversal of 8280505 is 5050828.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4787344 + 3493161 = 2188^2 + 1869^2 .

It is not a de Polignac number, because 8280505 - 2³ = 8280497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8280509) 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, 828046 + ... + 828055.

It is an arithmetic number, because the mean of its divisors is an integer number (2484153).

Almost surely, 2^8280505 is an apocalyptic number.

It is an amenable number.

8280505 is a deficient number, since it is larger than the sum of its proper divisors (1656107).

8280505 is a wasteful number, since it uses less digits than its factorization.

8280505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1656106.

The product of its (nonzero) digits is 3200, while the sum is 28.

The square root of 8280505 is about 2877.5866624656. The cubic root of 8280505 is about 202.3107412228.

The spelling of 8280505 in words is "eight million, two hundred eighty thousand, five hundred five".