28249769 has 2 divisors, whose sum is σ = 28249770. Its totient is φ = 28249768.

The previous prime is 28249763. The next prime is 28249777. The reversal of 28249769 is 96794282.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27667600 + 582169 = 5260^2 + 763^2 .

It is a cyclic number.

It is not a de Polignac number, because 28249769 - 2¹² = 28245673 is a prime.

It is a super-2 number, since 2×28249769² = 1596098897106722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (28249763) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14124884 + 14124885.

It is an arithmetic number, because the mean of its divisors is an integer number (14124885).

Almost surely, 2^28249769 is an apocalyptic number.

It is an amenable number.

28249769 is a deficient number, since it is larger than the sum of its proper divisors (1).

28249769 is an equidigital number, since it uses as much as digits as its factorization.

28249769 is an evil number, because the sum of its binary digits is even.

The product of its digits is 435456, while the sum is 47.

The square root of 28249769 is about 5315.0511756708. The cubic root of 28249769 is about 304.5591373157.

The spelling of 28249769 in words is "twenty-eight million, two hundred forty-nine thousand, seven hundred sixty-nine".