28108819 has 2 divisors, whose sum is σ = 28108820. Its totient is φ = 28108818.

The previous prime is 28108807. The next prime is 28108823. The reversal of 28108819 is 91880182.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28108819 - 2⁹ = 28108307 is a prime.

It is a super-2 number, since 2×28108819² = 1580211411149522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28108889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14054409 + 14054410.

It is an arithmetic number, because the mean of its divisors is an integer number (14054410).

Almost surely, 2^28108819 is an apocalyptic number.

28108819 is a deficient number, since it is larger than the sum of its proper divisors (1).

28108819 is an equidigital number, since it uses as much as digits as its factorization.

28108819 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9216, while the sum is 37.

The square root of 28108819 is about 5301.7750801029. The cubic root of 28108819 is about 304.0517679326.

The spelling of 28108819 in words is "twenty-eight million, one hundred eight thousand, eight hundred nineteen".