28838385 has 12 divisors (see below), whose sum is σ = 49986612. Its totient is φ = 15380448.

The previous prime is 28838377. The next prime is 28838393. The reversal of 28838385 is 58383882.

It is an interprime number because it is at equal distance from previous prime (28838377) and next prime (28838393).

It can be written as a sum of positive squares in 2 ways, for example, as 12702096 + 16136289 = 3564^2 + 4017^2 .

It is not a de Polignac number, because 28838385 - 2³ = 28838377 is a prime.

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: 640853 = 28838385 / (2 + 8 + 8 + 3 + 8 + 3 + 8 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 28838385.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 320382 + ... + 320471.

It is an arithmetic number, because the mean of its divisors is an integer number (4165551).

Almost surely, 2^28838385 is an apocalyptic number.

It is an amenable number.

28838385 is a deficient number, since it is larger than the sum of its proper divisors (21148227).

28838385 is a wasteful number, since it uses less digits than its factorization.

28838385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 640864 (or 640861 counting only the distinct ones).

The product of its digits is 368640, while the sum is 45.

The square root of 28838385 is about 5370.1382663764. The cubic root of 28838385 is about 306.6598920736.

The spelling of 28838385 in words is "twenty-eight million, eight hundred thirty-eight thousand, three hundred eighty-five".