28899387 has 24 divisors (see below), whose sum is σ = 45759168. Its totient is φ = 17430000.

The previous prime is 28899379. The next prime is 28899389. The reversal of 28899387 is 78399882.

It is not a de Polignac number, because 28899387 - 2³ = 28899379 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28899389) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 24268 + ... + 25430.

It is an arithmetic number, because the mean of its divisors is an integer number (1906632).

Almost surely, 2^28899387 is an apocalyptic number.

28899387 is a deficient number, since it is larger than the sum of its proper divisors (16859781).

28899387 is a wasteful number, since it uses less digits than its factorization.

28899387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1431 (or 1428 counting only the distinct ones).

The product of its digits is 1741824, while the sum is 54.

The square root of 28899387 is about 5375.8150079779. The cubic root of 28899387 is about 306.8759662628.

The spelling of 28899387 in words is "twenty-eight million, eight hundred ninety-nine thousand, three hundred eighty-seven".