28801439 has 2 divisors, whose sum is σ = 28801440. Its totient is φ = 28801438.

The previous prime is 28801361. The next prime is 28801447. The reversal of 28801439 is 93410882.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28801439 - 2¹² = 28797343 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 28801399 and 28801408.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28801489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14400719 + 14400720.

It is an arithmetic number, because the mean of its divisors is an integer number (14400720).

Almost surely, 2^28801439 is an apocalyptic number.

28801439 is a deficient number, since it is larger than the sum of its proper divisors (1).

28801439 is an equidigital number, since it uses as much as digits as its factorization.

28801439 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13824, while the sum is 35.

The square root of 28801439 is about 5366.6972152340. The cubic root of 28801439 is about 306.5288780542.

The spelling of 28801439 in words is "twenty-eight million, eight hundred one thousand, four hundred thirty-nine".