28291588669 has 2 divisors, whose sum is σ = 28291588670. Its totient is φ = 28291588668.

The previous prime is 28291588643. The next prime is 28291588723. The reversal of 28291588669 is 96688519282.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26361743769 + 1929844900 = 162363^2 + 43930^2 .

It is a cyclic number.

It is not a de Polignac number, because 28291588669 - 2²³ = 28283200061 is a prime.

It is a super-5 number, since 5×28291588669⁵ (a number of 53 digits) contains 55555 as substring. Note that it is a super-d number also for d = 2.

It is a self number, because there is not a number n which added to its sum of digits gives 28291588669.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28291588469) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14145794334 + 14145794335.

It is an arithmetic number, because the mean of its divisors is an integer number (14145794335).

Almost surely, 2^28291588669 is an apocalyptic number.

It is an amenable number.

28291588669 is a deficient number, since it is larger than the sum of its proper divisors (1).

28291588669 is an equidigital number, since it uses as much as digits as its factorization.

28291588669 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 29859840, while the sum is 64.

The spelling of 28291588669 in words is "twenty-eight billion, two hundred ninety-one million, five hundred eighty-eight thousand, six hundred sixty-nine".