28788239 has 2 divisors, whose sum is σ = 28788240. Its totient is φ = 28788238.

The previous prime is 28788229. The next prime is 28788247. The reversal of 28788239 is 93288782.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28788239 - 2⁴ = 28788223 is a prime.

It is a super-2 number, since 2×28788239² = 1657525409442242, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 28788193 and 28788202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28788229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14394119 + 14394120.

It is an arithmetic number, because the mean of its divisors is an integer number (14394120).

Almost surely, 2^28788239 is an apocalyptic number.

28788239 is a deficient number, since it is larger than the sum of its proper divisors (1).

28788239 is an equidigital number, since it uses as much as digits as its factorization.

28788239 is an evil number, because the sum of its binary digits is even.

The product of its digits is 387072, while the sum is 47.

The square root of 28788239 is about 5365.4672676292. The cubic root of 28788239 is about 306.4820424374.

The spelling of 28788239 in words is "twenty-eight million, seven hundred eighty-eight thousand, two hundred thirty-nine".