16280505 has 12 divisors (see below), whose sum is σ = 28219620. Its totient is φ = 8682912.

The previous prime is 16280497. The next prime is 16280581. The reversal of 16280505 is 50508261.

It can be written as a sum of positive squares in 2 ways, for example, as 10169721 + 6110784 = 3189^2 + 2472^2 .

It is not a de Polignac number, because 16280505 - 2³ = 16280497 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 180850 + ... + 180939.

It is an arithmetic number, because the mean of its divisors is an integer number (2351635).

Almost surely, 2^16280505 is an apocalyptic number.

16280505 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

16280505 is a deficient number, since it is larger than the sum of its proper divisors (11939115).

16280505 is a wasteful number, since it uses less digits than its factorization.

16280505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 361800 (or 361797 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 27.

The square root of 16280505 is about 4034.9107796827. The cubic root of 16280505 is about 253.4482463820.

Adding to 16280505 its reverse (50508261), we get a palindrome (66788766).

The spelling of 16280505 in words is "sixteen million, two hundred eighty thousand, five hundred five".