28876399 has 4 divisors (see below), whose sum is σ = 28932136. Its totient is φ = 28820664.

The previous prime is 28876381. The next prime is 28876417. The reversal of 28876399 is 99367882.

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

It is an interprime number because it is at equal distance from previous prime (28876381) and next prime (28876417).

It is a cyclic number.

It is not a de Polignac number, because 28876399 - 2⁷ = 28876271 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 (28876499) 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, 27084 + ... + 28129.

It is an arithmetic number, because the mean of its divisors is an integer number (7233034).

Almost surely, 2^28876399 is an apocalyptic number.

28876399 is a deficient number, since it is larger than the sum of its proper divisors (55737).

28876399 is an equidigital number, since it uses as much as digits as its factorization.

28876399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55736.

The product of its digits is 1306368, while the sum is 52.

The square root of 28876399 is about 5373.6764882155. The cubic root of 28876399 is about 306.7945765776.

The spelling of 28876399 in words is "twenty-eight million, eight hundred seventy-six thousand, three hundred ninety-nine".