28328819 has 2 divisors, whose sum is σ = 28328820. Its totient is φ = 28328818.

The previous prime is 28328809. The next prime is 28328821. The reversal of 28328819 is 91882382.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28328819 - 2¹⁶ = 28263283 is a prime.

It is a super-2 number, since 2×28328819² = 1605043971869522, which contains 22 as substring.

Together with 28328821, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28328809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14164409 + 14164410.

It is an arithmetic number, because the mean of its divisors is an integer number (14164410).

Almost surely, 2^28328819 is an apocalyptic number.

28328819 is a deficient number, since it is larger than the sum of its proper divisors (1).

28328819 is an equidigital number, since it uses as much as digits as its factorization.

28328819 is an evil number, because the sum of its binary digits is even.

The product of its digits is 55296, while the sum is 41.

The square root of 28328819 is about 5322.4824095529. The cubic root of 28328819 is about 304.8429505898.

The spelling of 28328819 in words is "twenty-eight million, three hundred twenty-eight thousand, eight hundred nineteen".