28606402369 has 4 divisors (see below), whose sum is σ = 28611688644. Its totient is φ = 28601116096.

The previous prime is 28606402309. The next prime is 28606402387. The reversal of 28606402369 is 96320460682.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 96320460682 = 2 ⋅48160230341.

It can be written as a sum of positive squares in 2 ways, for example, as 13889801025 + 14716601344 = 117855^2 + 121312^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28606402369 is a prime.

It is a super-2 number, since 2×28606402369² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28606402309) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2635012 + ... + 2645845.

It is an arithmetic number, because the mean of its divisors is an integer number (7152922161).

Almost surely, 2^28606402369 is an apocalyptic number.

It is an amenable number.

28606402369 is a deficient number, since it is larger than the sum of its proper divisors (5286275).

28606402369 is an equidigital number, since it uses as much as digits as its factorization.

28606402369 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5286274.

The product of its (nonzero) digits is 746496, while the sum is 46.

The spelling of 28606402369 in words is "twenty-eight billion, six hundred six million, four hundred two thousand, three hundred sixty-nine".