28916865 has 64 divisors (see below), whose sum is σ = 54835200. Its totient is φ = 14427072.

The previous prime is 28916863. The next prime is 28916887. The reversal of 28916865 is 56861982.

It is not a de Polignac number, because 28916865 - 2¹ = 28916863 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 28916865.

It is not an unprimeable number, because it can be changed into a prime (28916863) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 207966 + ... + 208104.

It is an arithmetic number, because the mean of its divisors is an integer number (856800).

Almost surely, 2^28916865 is an apocalyptic number.

28916865 is the 3105-th octagonal number.

It is an amenable number.

28916865 is a deficient number, since it is larger than the sum of its proper divisors (25918335).

28916865 is a wasteful number, since it uses less digits than its factorization.

28916865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 243 (or 237 counting only the distinct ones).

The product of its digits is 207360, while the sum is 45.

The square root of 28916865 is about 5377.4403762385. The cubic root of 28916865 is about 306.9378187538.

The spelling of 28916865 in words is "twenty-eight million, nine hundred sixteen thousand, eight hundred sixty-five".