28388819 has 2 divisors, whose sum is σ = 28388820. Its totient is φ = 28388818.

The previous prime is 28388809. The next prime is 28388849. The reversal of 28388819 is 91888382.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28388819 - 2⁴ = 28388803 is a prime.

It is a super-3 number, since 3×28388819³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28388809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14194409 + 14194410.

It is an arithmetic number, because the mean of its divisors is an integer number (14194410).

Almost surely, 2^28388819 is an apocalyptic number.

28388819 is a deficient number, since it is larger than the sum of its proper divisors (1).

28388819 is an equidigital number, since it uses as much as digits as its factorization.

28388819 is an evil number, because the sum of its binary digits is even.

The product of its digits is 221184, while the sum is 47.

The square root of 28388819 is about 5328.1158958867. The cubic root of 28388819 is about 305.0580163755.

The spelling of 28388819 in words is "twenty-eight million, three hundred eighty-eight thousand, eight hundred nineteen".