28503239 has 2 divisors, whose sum is σ = 28503240. Its totient is φ = 28503238.

The previous prime is 28503227. The next prime is 28503247. The reversal of 28503239 is 93230582.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28503239 - 2¹² = 28499143 is a prime.

It is a super-2 number, since 2×28503239² = 1624869266982242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28503289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14251619 + 14251620.

It is an arithmetic number, because the mean of its divisors is an integer number (14251620).

Almost surely, 2^28503239 is an apocalyptic number.

28503239 is a deficient number, since it is larger than the sum of its proper divisors (1).

28503239 is an equidigital number, since it uses as much as digits as its factorization.

28503239 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 28503239 is about 5338.8424775414. The cubic root of 28503239 is about 305.4673083683.

The spelling of 28503239 in words is "twenty-eight million, five hundred three thousand, two hundred thirty-nine".