28820039 has 2 divisors, whose sum is σ = 28820040. Its totient is φ = 28820038.

The previous prime is 28820023. The next prime is 28820063. The reversal of 28820039 is 93002882.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28820039 - 2⁴ = 28820023 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 28819987 and 28820014.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28820009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14410019 + 14410020.

It is an arithmetic number, because the mean of its divisors is an integer number (14410020).

Almost surely, 2^28820039 is an apocalyptic number.

28820039 is a deficient number, since it is larger than the sum of its proper divisors (1).

28820039 is an equidigital number, since it uses as much as digits as its factorization.

28820039 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 28820039 is about 5368.4298449360. The cubic root of 28820039 is about 306.5948494135.

The spelling of 28820039 in words is "twenty-eight million, eight hundred twenty thousand, thirty-nine".