28238399 has 8 divisors (see below), whose sum is σ = 32959488. Its totient is φ = 23689080.

The previous prime is 28238393. The next prime is 28238429. The reversal of 28238399 is 99383282.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28238399 - 2¹² = 28234303 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28238393) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42587 + ... + 43244.

It is an arithmetic number, because the mean of its divisors is an integer number (4119936).

Almost surely, 2^28238399 is an apocalyptic number.

28238399 is a deficient number, since it is larger than the sum of its proper divisors (4721089).

28238399 is an equidigital number, since it uses as much as digits as its factorization.

28238399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85885.

The product of its digits is 186624, while the sum is 44.

The square root of 28238399 is about 5313.9814640249. The cubic root of 28238399 is about 304.5182720603.

The spelling of 28238399 in words is "twenty-eight million, two hundred thirty-eight thousand, three hundred ninety-nine".