28813815 has 12 divisors (see below), whose sum is σ = 49944024. Its totient is φ = 15367344.

The previous prime is 28813801. The next prime is 28813847. The reversal of 28813815 is 51831882.

It is not a de Polignac number, because 28813815 - 2⁶ = 28813751 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28813815.

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, 320109 + ... + 320198.

It is an arithmetic number, because the mean of its divisors is an integer number (4162002).

Almost surely, 2^28813815 is an apocalyptic number.

28813815 is a deficient number, since it is larger than the sum of its proper divisors (21130209).

28813815 is a wasteful number, since it uses less digits than its factorization.

28813815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 640318 (or 640315 counting only the distinct ones).

The product of its digits is 15360, while the sum is 36.

The square root of 28813815 is about 5367.8501283102. The cubic root of 28813815 is about 306.5727769968.

The spelling of 28813815 in words is "twenty-eight million, eight hundred thirteen thousand, eight hundred fifteen".