28115999 has 2 divisors, whose sum is σ = 28116000. Its totient is φ = 28115998.

The previous prime is 28115963. The next prime is 28116043. The reversal of 28115999 is 99951182.

It is a happy number.

It is an a-pointer prime, because the next prime (28116043) can be obtained adding 28115999 to its sum of digits (44).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28115999 - 2¹² = 28111903 is a prime.

It is a super-4 number, since 4×28115999⁴ (a number of 31 digits) contains 4444 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28115939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14057999 + 14058000.

It is an arithmetic number, because the mean of its divisors is an integer number (14058000).

Almost surely, 2^28115999 is an apocalyptic number.

28115999 is a deficient number, since it is larger than the sum of its proper divisors (1).

28115999 is an equidigital number, since it uses as much as digits as its factorization.

28115999 is an evil number, because the sum of its binary digits is even.

The product of its digits is 58320, while the sum is 44.

The square root of 28115999 is about 5302.4521685726. The cubic root of 28115999 is about 304.0776543023.

The spelling of 28115999 in words is "twenty-eight million, one hundred fifteen thousand, nine hundred ninety-nine".