28799399 has 2 divisors, whose sum is σ = 28799400. Its totient is φ = 28799398.

The previous prime is 28799389. The next prime is 28799401. The reversal of 28799399 is 99399782.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28799399 - 2¹² = 28795303 is a prime.

It is a super-2 number, since 2×28799399² = 1658810765522402, which contains 22 as substring.

Together with 28799401, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28799359) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14399699 + 14399700.

It is an arithmetic number, because the mean of its divisors is an integer number (14399700).

Almost surely, 2^28799399 is an apocalyptic number.

28799399 is a deficient number, since it is larger than the sum of its proper divisors (1).

28799399 is an equidigital number, since it uses as much as digits as its factorization.

28799399 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2204496, while the sum is 56.

The square root of 28799399 is about 5366.5071508384. The cubic root of 28799399 is about 306.5216407575.

The spelling of 28799399 in words is "twenty-eight million, seven hundred ninety-nine thousand, three hundred ninety-nine".