28713239 has 2 divisors, whose sum is σ = 28713240. Its totient is φ = 28713238.

The previous prime is 28713233. The next prime is 28713241. The reversal of 28713239 is 93231782.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28713239 is a prime.

It is a super-2 number, since 2×28713239² = 1648900187742242, which contains 22 as substring.

Together with 28713241, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 28713199 and 28713208.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28713233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14356619 + 14356620.

It is an arithmetic number, because the mean of its divisors is an integer number (14356620).

Almost surely, 2^28713239 is an apocalyptic number.

28713239 is a deficient number, since it is larger than the sum of its proper divisors (1).

28713239 is an equidigital number, since it uses as much as digits as its factorization.

28713239 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18144, while the sum is 35.

The square root of 28713239 is about 5358.4735699637. The cubic root of 28713239 is about 306.2156588454.

The spelling of 28713239 in words is "twenty-eight million, seven hundred thirteen thousand, two hundred thirty-nine".