28664038669 has 6 divisors (see below), whose sum is σ = 33343881774. Its totient is φ = 24569175960.

The previous prime is 28664038651. The next prime is 28664038687. The reversal of 28664038669 is 96683046682.

It is an interprime number because it is at equal distance from previous prime (28664038651) and next prime (28664038687).

It can be written as a sum of positive squares in only one way, i.e., 27501910569 + 1162128100 = 165837^2 + 34090^2 .

It is not a de Polignac number, because 28664038669 - 2⁷ = 28664038541 is a prime.

It is a super-2 number, since 2×28664038669² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28664038699) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 292490142 + ... + 292490239.

It is an arithmetic number, because the mean of its divisors is an integer number (5557313629).

Almost surely, 2^28664038669 is an apocalyptic number.

It is an amenable number.

28664038669 is a deficient number, since it is larger than the sum of its proper divisors (4679843105).

28664038669 is an equidigital number, since it uses as much as digits as its factorization.

28664038669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 584980395 (or 584980388 counting only the distinct ones).

The product of its (nonzero) digits is 17915904, while the sum is 58.

The spelling of 28664038669 in words is "twenty-eight billion, six hundred sixty-four million, thirty-eight thousand, six hundred sixty-nine".