28607865 has 32 divisors (see below), whose sum is σ = 53778816. Its totient is φ = 12802560.

The previous prime is 28607809. The next prime is 28607867. The reversal of 28607865 is 56870682.

It is not a de Polignac number, because 28607865 - 2⁶ = 28607801 is a prime.

28607865 is a modest number, since divided by 7865 gives 2860 as remainder.

It is not an unprimeable number, because it can be changed into a prime (28607867) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4524 + ... + 8813.

It is an arithmetic number, because the mean of its divisors is an integer number (1680588).

Almost surely, 2^28607865 is an apocalyptic number.

It is an amenable number.

28607865 is a deficient number, since it is larger than the sum of its proper divisors (25170951).

28607865 is a wasteful number, since it uses less digits than its factorization.

28607865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13369.

The product of its (nonzero) digits is 161280, while the sum is 42.

The square root of 28607865 is about 5348.6320681086. The cubic root of 28607865 is about 305.8406086039.

The spelling of 28607865 in words is "twenty-eight million, six hundred seven thousand, eight hundred sixty-five".