28163542815 has 12 divisors (see below), whose sum is σ = 48816807624. Its totient is φ = 15020556144.

The previous prime is 28163542793. The next prime is 28163542829. The reversal of 28163542815 is 51824536182.

28163542815 is a `hidden beast` number, since 2 + 8 + 1 + 635 + 4 + 2 + 8 + 1 + 5 = 666.

It is not a de Polignac number, because 28163542815 - 2⁵ = 28163542783 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 625856507 = 28163542815 / (2 + 8 + 1 + 6 + 3 + 5 + 4 + 2 + 8 + 1 + 5).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 312928209 + ... + 312928298.

It is an arithmetic number, because the mean of its divisors is an integer number (4068067302).

Almost surely, 2^28163542815 is an apocalyptic number.

28163542815 is a deficient number, since it is larger than the sum of its proper divisors (20653264809).

28163542815 is a wasteful number, since it uses less digits than its factorization.

28163542815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 625856518 (or 625856515 counting only the distinct ones).

The product of its digits is 460800, while the sum is 45.

The spelling of 28163542815 in words is "twenty-eight billion, one hundred sixty-three million, five hundred forty-two thousand, eight hundred fifteen".