28668469 has 2 divisors, whose sum is σ = 28668470. Its totient is φ = 28668468.

The previous prime is 28668427. The next prime is 28668481. The reversal of 28668469 is 96486682.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28483569 + 184900 = 5337^2 + 430^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28668469 is a prime.

It is a super-2 number, since 2×28668469² = 1643762229607922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28368469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14334234 + 14334235.

It is an arithmetic number, because the mean of its divisors is an integer number (14334235).

Almost surely, 2^28668469 is an apocalyptic number.

It is an amenable number.

28668469 is a deficient number, since it is larger than the sum of its proper divisors (1).

28668469 is an equidigital number, since it uses as much as digits as its factorization.

28668469 is an evil number, because the sum of its binary digits is even.

The product of its digits is 995328, while the sum is 49.

The square root of 28668469 is about 5354.2944446491. The cubic root of 28668469 is about 306.0564244421.

The spelling of 28668469 in words is "twenty-eight million, six hundred sixty-eight thousand, four hundred sixty-nine".