28247861009 has 2 divisors, whose sum is σ = 28247861010. Its totient is φ = 28247861008.

The previous prime is 28247860981. The next prime is 28247861069. The reversal of 28247861009 is 90016874282.

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., 25887844609 + 2360016400 = 160897^2 + 48580^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28247861009 is a prime.

It is not a weakly prime, because it can be changed into another prime (28247861069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14123930504 + 14123930505.

It is an arithmetic number, because the mean of its divisors is an integer number (14123930505).

Almost surely, 2^28247861009 is an apocalyptic number.

It is an amenable number.

28247861009 is a deficient number, since it is larger than the sum of its proper divisors (1).

28247861009 is an equidigital number, since it uses as much as digits as its factorization.

28247861009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 387072, while the sum is 47.

The spelling of 28247861009 in words is "twenty-eight billion, two hundred forty-seven million, eight hundred sixty-one thousand, nine".