28289669 has 2 divisors, whose sum is σ = 28289670. Its totient is φ = 28289668.

The previous prime is 28289647. The next prime is 28289687. The reversal of 28289669 is 96698282.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26399044 + 1890625 = 5138^2 + 1375^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28289669 is a prime.

It is a super-2 number, since 2×28289669² = 1600610744259122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28289369) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14144834 + 14144835.

It is an arithmetic number, because the mean of its divisors is an integer number (14144835).

Almost surely, 2^28289669 is an apocalyptic number.

It is an amenable number.

28289669 is a deficient number, since it is larger than the sum of its proper divisors (1).

28289669 is an equidigital number, since it uses as much as digits as its factorization.

28289669 is an evil number, because the sum of its binary digits is even.

The product of its digits is 746496, while the sum is 50.

The square root of 28289669 is about 5318.8033428582. The cubic root of 28289669 is about 304.7024563984.

The spelling of 28289669 in words is "twenty-eight million, two hundred eighty-nine thousand, six hundred sixty-nine".