28421171515 has 12 divisors (see below), whose sum is σ = 37487760912. Its totient is φ = 20669942480.

The previous prime is 28421171503. The next prime is 28421171521. The reversal of 28421171515 is 51517112482.

It is not a de Polignac number, because 28421171515 - 2²⁷ = 28286953787 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 23487967 + ... + 23489176.

It is an arithmetic number, because the mean of its divisors is an integer number (3123980076).

Almost surely, 2^28421171515 is an apocalyptic number.

28421171515 is a deficient number, since it is larger than the sum of its proper divisors (9066589397).

28421171515 is a wasteful number, since it uses less digits than its factorization.

28421171515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46977170 (or 46977159 counting only the distinct ones).

The product of its digits is 22400, while the sum is 37.

Adding to 28421171515 its reverse (51517112482), we get a palindrome (79938283997).

The spelling of 28421171515 in words is "twenty-eight billion, four hundred twenty-one million, one hundred seventy-one thousand, five hundred fifteen".