28128232417 has 2 divisors, whose sum is σ = 28128232418. Its totient is φ = 28128232416.

The previous prime is 28128232403. The next prime is 28128232493. The reversal of 28128232417 is 71423282182.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28030795776 + 97436641 = 167424^2 + 9871^2 .

It is a cyclic number.

It is not a de Polignac number, because 28128232417 - 2⁷ = 28128232289 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28128232417.

It is not a weakly prime, because it can be changed into another prime (28128238417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14064116208 + 14064116209.

It is an arithmetic number, because the mean of its divisors is an integer number (14064116209).

Almost surely, 2^28128232417 is an apocalyptic number.

It is an amenable number.

28128232417 is a deficient number, since it is larger than the sum of its proper divisors (1).

28128232417 is an equidigital number, since it uses as much as digits as its factorization.

28128232417 is an evil number, because the sum of its binary digits is even.

The product of its digits is 86016, while the sum is 40.

The spelling of 28128232417 in words is "twenty-eight billion, one hundred twenty-eight million, two hundred thirty-two thousand, four hundred seventeen".