28797239 has 2 divisors, whose sum is σ = 28797240. Its totient is φ = 28797238.

The previous prime is 28797193. The next prime is 28797277. The reversal of 28797239 is 93279782.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28797239 - 2²⁰ = 27748663 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 28797193 and 28797202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28790239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14398619 + 14398620.

It is an arithmetic number, because the mean of its divisors is an integer number (14398620).

Almost surely, 2^28797239 is an apocalyptic number.

28797239 is a deficient number, since it is larger than the sum of its proper divisors (1).

28797239 is an equidigital number, since it uses as much as digits as its factorization.

28797239 is an evil number, because the sum of its binary digits is even.

The product of its digits is 381024, while the sum is 47.

The square root of 28797239 is about 5366.3058988470. The cubic root of 28797239 is about 306.5139773650.

The spelling of 28797239 in words is "twenty-eight million, seven hundred ninety-seven thousand, two hundred thirty-nine".