28072439 has 2 divisors, whose sum is σ = 28072440. Its totient is φ = 28072438.

The previous prime is 28072433. The next prime is 28072463. The reversal of 28072439 is 93427082.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28072439 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 28072399 and 28072408.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28072433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14036219 + 14036220.

It is an arithmetic number, because the mean of its divisors is an integer number (14036220).

Almost surely, 2^28072439 is an apocalyptic number.

28072439 is a deficient number, since it is larger than the sum of its proper divisors (1).

28072439 is an equidigital number, since it uses as much as digits as its factorization.

28072439 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24192, while the sum is 35.

The square root of 28072439 is about 5298.3430428767. The cubic root of 28072439 is about 303.9205377204.

The spelling of 28072439 in words is "twenty-eight million, seventy-two thousand, four hundred thirty-nine".