28934865 has 12 divisors (see below), whose sum is σ = 50153844. Its totient is φ = 15431904.

The previous prime is 28934831. The next prime is 28934869. The reversal of 28934865 is 56843982.

It can be written as a sum of positive squares in 2 ways, for example, as 11370384 + 17564481 = 3372^2 + 4191^2 .

It is not a de Polignac number, because 28934865 - 2¹⁰ = 28933841 is a prime.

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

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 642997 = 28934865 / (2 + 8 + 9 + 3 + 4 + 8 + 6 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 28934865.

It is not an unprimeable number, because it can be changed into a prime (28934869) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 321454 + ... + 321543.

It is an arithmetic number, because the mean of its divisors is an integer number (4179487).

Almost surely, 2^28934865 is an apocalyptic number.

It is an amenable number.

28934865 is a deficient number, since it is larger than the sum of its proper divisors (21218979).

28934865 is a wasteful number, since it uses less digits than its factorization.

28934865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 643008 (or 643005 counting only the distinct ones).

The product of its digits is 414720, while the sum is 45.

The square root of 28934865 is about 5379.1137745915. The cubic root of 28934865 is about 307.0014924931.

The spelling of 28934865 in words is "twenty-eight million, nine hundred thirty-four thousand, eight hundred sixty-five".