28316313 has 12 divisors (see below), whose sum is σ = 40948180. Its totient is φ = 18855936.

The previous prime is 28316311. The next prime is 28316333. The reversal of 28316313 is 31361382.

It is a happy number.

28316313 is a `hidden beast` number, since 28 + 3 + 1 + 631 + 3 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1814409 + 26501904 = 1347^2 + 5148^2 .

It is not a de Polignac number, because 28316313 - 2¹ = 28316311 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28316311) 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, 12345 + ... + 14457.

Almost surely, 2^28316313 is an apocalyptic number.

It is an amenable number.

28316313 is a deficient number, since it is larger than the sum of its proper divisors (12631867).

28316313 is a wasteful number, since it uses less digits than its factorization.

28316313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3608 (or 3605 counting only the distinct ones).

The product of its digits is 2592, while the sum is 27.

The square root of 28316313 is about 5321.3074521211. The cubic root of 28316313 is about 304.7980854758.

Adding to 28316313 its reverse (31361382), we get a palindrome (59677695).

The spelling of 28316313 in words is "twenty-eight million, three hundred sixteen thousand, three hundred thirteen".