28859815 has 16 divisors (see below), whose sum is σ = 35764992. Its totient is φ = 22339584.

The previous prime is 28859813. The next prime is 28859839. The reversal of 28859815 is 51895882.

It is a cyclic number.

It is not a de Polignac number, because 28859815 - 2¹ = 28859813 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28859813) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47242 + ... + 47848.

It is an arithmetic number, because the mean of its divisors is an integer number (2235312).

Almost surely, 2^28859815 is an apocalyptic number.

28859815 is a deficient number, since it is larger than the sum of its proper divisors (6905177).

28859815 is a wasteful number, since it uses less digits than its factorization.

28859815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 906.

The product of its digits is 230400, while the sum is 46.

The square root of 28859815 is about 5372.1331889669. The cubic root of 28859815 is about 306.7358336162.

The spelling of 28859815 in words is "twenty-eight million, eight hundred fifty-nine thousand, eight hundred fifteen".