28636343249 has 2 divisors, whose sum is σ = 28636343250. Its totient is φ = 28636343248.

The previous prime is 28636343233. The next prime is 28636343257. The reversal of 28636343249 is 94234363682.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22322451649 + 6313891600 = 149407^2 + 79460^2 .

It is a cyclic number.

It is not a de Polignac number, because 28636343249 - 2⁴ = 28636343233 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28636343197 and 28636343206.

It is not a weakly prime, because it can be changed into another prime (28636343299) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14318171624 + 14318171625.

It is an arithmetic number, because the mean of its divisors is an integer number (14318171625).

Almost surely, 2^28636343249 is an apocalyptic number.

It is an amenable number.

28636343249 is a deficient number, since it is larger than the sum of its proper divisors (1).

28636343249 is an equidigital number, since it uses as much as digits as its factorization.

28636343249 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4478976, while the sum is 50.

The spelling of 28636343249 in words is "twenty-eight billion, six hundred thirty-six million, three hundred forty-three thousand, two hundred forty-nine".