28700865 has 32 divisors (see below), whose sum is σ = 52790400. Its totient is φ = 14777280.

The previous prime is 28700851. The next prime is 28700869. The reversal of 28700865 is 56800782.

It is not a de Polignac number, because 28700865 - 2¹³ = 28692673 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28700869) 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, 250 + ... + 7580.

It is an arithmetic number, because the mean of its divisors is an integer number (1649700).

Almost surely, 2^28700865 is an apocalyptic number.

It is an amenable number.

28700865 is a deficient number, since it is larger than the sum of its proper divisors (24089535).

28700865 is a wasteful number, since it uses less digits than its factorization.

28700865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7374 (or 7368 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 36.

The square root of 28700865 is about 5357.3188256814. The cubic root of 28700865 is about 306.1716645402.

The spelling of 28700865 in words is "twenty-eight million, seven hundred thousand, eight hundred sixty-five".