28372315 has 4 divisors (see below), whose sum is σ = 34046784. Its totient is φ = 22697848.

The previous prime is 28372313. The next prime is 28372321. The reversal of 28372315 is 51327382.

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

It is a cyclic number.

It is not a de Polignac number, because 28372315 - 2¹ = 28372313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28372313) 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, 2837227 + ... + 2837236.

It is an arithmetic number, because the mean of its divisors is an integer number (8511696).

Almost surely, 2^28372315 is an apocalyptic number.

28372315 is a deficient number, since it is larger than the sum of its proper divisors (5674469).

28372315 is an equidigital number, since it uses as much as digits as its factorization.

28372315 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5674468.

The product of its digits is 10080, while the sum is 31.

The square root of 28372315 is about 5326.5669056157. The cubic root of 28372315 is about 304.9988891834.

Adding to 28372315 its reverse (51327382), we get a palindrome (79699697).

The spelling of 28372315 in words is "twenty-eight million, three hundred seventy-two thousand, three hundred fifteen".