28859399 has 4 divisors (see below), whose sum is σ = 28879536. Its totient is φ = 28839264.

The previous prime is 28859393. The next prime is 28859417. The reversal of 28859399 is 99395882.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28859399 - 2⁸ = 28859143 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28859399.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28859393) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7739 + ... + 10844.

It is an arithmetic number, because the mean of its divisors is an integer number (7219884).

Almost surely, 2^28859399 is an apocalyptic number.

28859399 is a deficient number, since it is larger than the sum of its proper divisors (20137).

28859399 is a wasteful number, since it uses less digits than its factorization.

28859399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20136.

The product of its digits is 1399680, while the sum is 53.

The square root of 28859399 is about 5372.0944705022. The cubic root of 28859399 is about 306.7343597939.

The spelling of 28859399 in words is "twenty-eight million, eight hundred fifty-nine thousand, three hundred ninety-nine".