28815855 has 16 divisors (see below), whose sum is σ = 46418400. Its totient is φ = 15264128.

The previous prime is 28815823. The next prime is 28815863. The reversal of 28815855 is 55851882.

It is a cyclic number.

It is not a de Polignac number, because 28815855 - 2⁵ = 28815823 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4212 + ... + 8681.

It is an arithmetic number, because the mean of its divisors is an integer number (2901150).

Almost surely, 2^28815855 is an apocalyptic number.

28815855 is a deficient number, since it is larger than the sum of its proper divisors (17602545).

28815855 is a wasteful number, since it uses less digits than its factorization.

28815855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13050.

The product of its digits is 128000, while the sum is 42.

The square root of 28815855 is about 5368.0401451554. The cubic root of 28815855 is about 306.5800118794.

The spelling of 28815855 in words is "twenty-eight million, eight hundred fifteen thousand, eight hundred fifty-five".