28520039 has 2 divisors, whose sum is σ = 28520040. Its totient is φ = 28520038.

The previous prime is 28520029. The next prime is 28520057. The reversal of 28520039 is 93002582.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28520039 - 2²⁰ = 27471463 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 28519993 and 28520020.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28520029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14260019 + 14260020.

It is an arithmetic number, because the mean of its divisors is an integer number (14260020).

Almost surely, 2^28520039 is an apocalyptic number.

28520039 is a deficient number, since it is larger than the sum of its proper divisors (1).

28520039 is an equidigital number, since it uses as much as digits as its factorization.

28520039 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 28520039 is about 5340.4156205299. The cubic root of 28520039 is about 305.5273114071.

The spelling of 28520039 in words is "twenty-eight million, five hundred twenty thousand, thirty-nine".