28506315 has 32 divisors (see below), whose sum is σ = 48522240. Its totient is φ = 14258816.

The previous prime is 28506301. The next prime is 28506319. The reversal of 28506315 is 51360582.

It is a cyclic number.

It is not a de Polignac number, because 28506315 - 2⁷ = 28506187 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28506319) 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, 17506 + ... + 19064.

It is an arithmetic number, because the mean of its divisors is an integer number (1516320).

Almost surely, 2^28506315 is an apocalyptic number.

28506315 is a deficient number, since it is larger than the sum of its proper divisors (20015925).

28506315 is a wasteful number, since it uses less digits than its factorization.

28506315 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1643.

The product of its (nonzero) digits is 7200, while the sum is 30.

The square root of 28506315 is about 5339.1305471959. The cubic root of 28506315 is about 305.4782964019.

Adding to 28506315 its reverse (51360582), we get a palindrome (79866897).

The spelling of 28506315 in words is "twenty-eight million, five hundred six thousand, three hundred fifteen".