28836945 has 32 divisors (see below), whose sum is σ = 51546240. Its totient is φ = 15295680.

The previous prime is 28836937. The next prime is 28836967. The reversal of 28836945 is 54963882.

28836945 is a `hidden beast` number, since 288 + 369 + 4 + 5 = 666.

It is not a de Polignac number, because 28836945 - 2³ = 28836937 is a prime.

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 28836945.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 30175 + ... + 31115.

It is an arithmetic number, because the mean of its divisors is an integer number (1610820).

Almost surely, 2^28836945 is an apocalyptic number.

It is an amenable number.

28836945 is a deficient number, since it is larger than the sum of its proper divisors (22709295).

28836945 is a wasteful number, since it uses less digits than its factorization.

28836945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1182 (or 1176 counting only the distinct ones).

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

The square root of 28836945 is about 5370.0041899425. The cubic root of 28836945 is about 306.6547877934.

Subtracting from 28836945 its sum of digits (45), we obtain a square (28836900 = 5370²).

The spelling of 28836945 in words is "twenty-eight million, eight hundred thirty-six thousand, nine hundred forty-five".