28217313 has 12 divisors (see below), whose sum is σ = 40804608. Its totient is φ = 18790200.

The previous prime is 28217257. The next prime is 28217327. The reversal of 28217313 is 31371282.

It is not a de Polignac number, because 28217313 - 2¹³ = 28209121 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28217363) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13488 + ... + 15438.

It is an arithmetic number, because the mean of its divisors is an integer number (3400384).

Almost surely, 2^28217313 is an apocalyptic number.

It is an amenable number.

28217313 is a deficient number, since it is larger than the sum of its proper divisors (12587295).

28217313 is a wasteful number, since it uses less digits than its factorization.

28217313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3564 (or 3561 counting only the distinct ones).

The product of its digits is 2016, while the sum is 27.

The square root of 28217313 is about 5311.9970820775. The cubic root of 28217313 is about 304.4424571958.

Adding to 28217313 its reverse (31371282), we get a palindrome (59588595).

The spelling of 28217313 in words is "twenty-eight million, two hundred seventeen thousand, three hundred thirteen".