28235909489 has 2 divisors, whose sum is σ = 28235909490. Its totient is φ = 28235909488.

The previous prime is 28235909447. The next prime is 28235909531. The reversal of 28235909489 is 98490953282.

It is a balanced prime because it is at equal distance from previous prime (28235909447) and next prime (28235909531).

It can be written as a sum of positive squares in only one way, i.e., 20845584400 + 7390325089 = 144380^2 + 85967^2 .

It is a cyclic number.

It is not a de Polignac number, because 28235909489 - 2²⁴ = 28219132273 is a prime.

It is a super-2 number, since 2×28235909489² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28235909089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14117954744 + 14117954745.

It is an arithmetic number, because the mean of its divisors is an integer number (14117954745).

Almost surely, 2^28235909489 is an apocalyptic number.

It is an amenable number.

28235909489 is a deficient number, since it is larger than the sum of its proper divisors (1).

28235909489 is an equidigital number, since it uses as much as digits as its factorization.

28235909489 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11197440, while the sum is 59.

The spelling of 28235909489 in words is "twenty-eight billion, two hundred thirty-five million, nine hundred nine thousand, four hundred eighty-nine".