28284399 has 24 divisors (see below), whose sum is σ = 47999952. Its totient is φ = 15822720.

The previous prime is 28284397. The next prime is 28284439. The reversal of 28284399 is 99348282.

It is not a de Polignac number, because 28284399 - 2¹ = 28284397 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28284397) 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, 9702 + ... + 12275.

It is an arithmetic number, because the mean of its divisors is an integer number (1999998).

Almost surely, 2^28284399 is an apocalyptic number.

28284399 is a deficient number, since it is larger than the sum of its proper divisors (19715553).

28284399 is a wasteful number, since it uses less digits than its factorization.

28284399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22007 (or 22004 counting only the distinct ones).

The product of its digits is 248832, while the sum is 45.

The square root of 28284399 is about 5318.3079075962. The cubic root of 28284399 is about 304.6835345125.

It can be divided in two parts, 2828 and 4399, that added together give a palindrome (7227).

The spelling of 28284399 in words is "twenty-eight million, two hundred eighty-four thousand, three hundred ninety-nine".