28955385 has 12 divisors (see below), whose sum is σ = 50189412. Its totient is φ = 15442848.

The previous prime is 28955363. The next prime is 28955393. The reversal of 28955385 is 58355982.

28955385 is a `hidden beast` number, since 28 + 95 + 538 + 5 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 6827769 + 22127616 = 2613^2 + 4704^2 .

It is not a de Polignac number, because 28955385 - 2⁹ = 28954873 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: 643453 = 28955385 / (2 + 8 + 9 + 5 + 5 + 3 + 8 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 28955385.

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, 321682 + ... + 321771.

It is an arithmetic number, because the mean of its divisors is an integer number (4182451).

Almost surely, 2^28955385 is an apocalyptic number.

It is an amenable number.

28955385 is a deficient number, since it is larger than the sum of its proper divisors (21234027).

28955385 is a wasteful number, since it uses less digits than its factorization.

28955385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 643464 (or 643461 counting only the distinct ones).

The product of its digits is 432000, while the sum is 45.

The square root of 28955385 is about 5381.0208139348. The cubic root of 28955385 is about 307.0740483528.

The spelling of 28955385 in words is "twenty-eight million, nine hundred fifty-five thousand, three hundred eighty-five".