28857439409 has 2 divisors, whose sum is σ = 28857439410. Its totient is φ = 28857439408.

The previous prime is 28857439367. The next prime is 28857439453. The reversal of 28857439409 is 90493475882.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22372680625 + 6484758784 = 149575^2 + 80528^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28857439409 is a prime.

It is not a weakly prime, because it can be changed into another prime (28857439469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14428719704 + 14428719705.

It is an arithmetic number, because the mean of its divisors is an integer number (14428719705).

Almost surely, 2^28857439409 is an apocalyptic number.

It is an amenable number.

28857439409 is a deficient number, since it is larger than the sum of its proper divisors (1).

28857439409 is an equidigital number, since it uses as much as digits as its factorization.

28857439409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17418240, while the sum is 59.

The spelling of 28857439409 in words is "twenty-eight billion, eight hundred fifty-seven million, four hundred thirty-nine thousand, four hundred nine".