28115438315 has 8 divisors (see below), whose sum is σ = 33756285168. Its totient is φ = 22480511200.

The previous prime is 28115438311. The next prime is 28115438341. The reversal of 28115438315 is 51383451182.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28115438315 - 2² = 28115438311 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28115438311) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1469477 + ... + 1488486.

It is an arithmetic number, because the mean of its divisors is an integer number (4219535646).

Almost surely, 2^28115438315 is an apocalyptic number.

28115438315 is a deficient number, since it is larger than the sum of its proper divisors (5640846853).

28115438315 is a wasteful number, since it uses less digits than its factorization.

28115438315 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2959869.

The product of its digits is 115200, while the sum is 41.

Adding to 28115438315 its reverse (51383451182), we get a palindrome (79498889497).

The spelling of 28115438315 in words is "twenty-eight billion, one hundred fifteen million, four hundred thirty-eight thousand, three hundred fifteen".