28626428309 has 2 divisors, whose sum is σ = 28626428310. Its totient is φ = 28626428308.

The previous prime is 28626428297. The next prime is 28626428323. The reversal of 28626428309 is 90382462682.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24395316100 + 4231112209 = 156190^2 + 65047^2 .

It is a cyclic number.

It is not a de Polignac number, because 28626428309 - 2¹² = 28626424213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28626428339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14313214154 + 14313214155.

It is an arithmetic number, because the mean of its divisors is an integer number (14313214155).

Almost surely, 2^28626428309 is an apocalyptic number.

It is an amenable number.

28626428309 is a deficient number, since it is larger than the sum of its proper divisors (1).

28626428309 is an equidigital number, since it uses as much as digits as its factorization.

28626428309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1990656, while the sum is 50.

The spelling of 28626428309 in words is "twenty-eight billion, six hundred twenty-six million, four hundred twenty-eight thousand, three hundred nine".