28386769 has 2 divisors, whose sum is σ = 28386770. Its totient is φ = 28386768.

The previous prime is 28386739. The next prime is 28386781. The reversal of 28386769 is 96768382.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27878400 + 508369 = 5280^2 + 713^2 .

It is a cyclic number.

It is not a de Polignac number, because 28386769 - 2¹¹ = 28384721 is a prime.

It is a super-2 number, since 2×28386769² = 1611617308518722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28386739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14193384 + 14193385.

It is an arithmetic number, because the mean of its divisors is an integer number (14193385).

Almost surely, 2^28386769 is an apocalyptic number.

It is an amenable number.

28386769 is a deficient number, since it is larger than the sum of its proper divisors (1).

28386769 is an equidigital number, since it uses as much as digits as its factorization.

28386769 is an evil number, because the sum of its binary digits is even.

The product of its digits is 870912, while the sum is 49.

The square root of 28386769 is about 5327.9235167183. The cubic root of 28386769 is about 305.0506732970.

The spelling of 28386769 in words is "twenty-eight million, three hundred eighty-six thousand, seven hundred sixty-nine".