28585915 has 4 divisors (see below), whose sum is σ = 34303104. Its totient is φ = 22868728.

The previous prime is 28585901. The next prime is 28585939. The reversal of 28585915 is 51958582.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28585915 - 2⁷ = 28585787 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2858587 + ... + 2858596.

It is an arithmetic number, because the mean of its divisors is an integer number (8575776).

Almost surely, 2^28585915 is an apocalyptic number.

28585915 is a deficient number, since it is larger than the sum of its proper divisors (5717189).

28585915 is an equidigital number, since it uses as much as digits as its factorization.

28585915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5717188.

The product of its digits is 144000, while the sum is 43.

The square root of 28585915 is about 5346.5797478388. The cubic root of 28585915 is about 305.7623676604.

The spelling of 28585915 in words is "twenty-eight million, five hundred eighty-five thousand, nine hundred fifteen".