28220039 has 2 divisors, whose sum is σ = 28220040. Its totient is φ = 28220038.

The previous prime is 28220033. The next prime is 28220041. The reversal of 28220039 is 93002282.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28220039 - 2⁸ = 28219783 is a prime.

It is a Sophie Germain prime.

Together with 28220041, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28220033) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14110019 + 14110020.

It is an arithmetic number, because the mean of its divisors is an integer number (14110020).

Almost surely, 2^28220039 is an apocalyptic number.

28220039 is a deficient number, since it is larger than the sum of its proper divisors (1).

28220039 is an equidigital number, since it uses as much as digits as its factorization.

28220039 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 28220039 is about 5312.2536648771. The cubic root of 28220039 is about 304.4522606737.

The spelling of 28220039 in words is "twenty-eight million, two hundred twenty thousand, thirty-nine".