28707869 has 2 divisors, whose sum is σ = 28707870. Its totient is φ = 28707868.

The previous prime is 28707863. The next prime is 28707871. The reversal of 28707869 is 96870782.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19035769 + 9672100 = 4363^2 + 3110^2 .

It is a cyclic number.

It is not a de Polignac number, because 28707869 - 2²⁰ = 27659293 is a prime.

It is a super-2 number, since 2×28707869² = 1648283485042322, which contains 22 as substring.

Together with 28707871, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28707863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14353934 + 14353935.

It is an arithmetic number, because the mean of its divisors is an integer number (14353935).

Almost surely, 2^28707869 is an apocalyptic number.

It is an amenable number.

28707869 is a deficient number, since it is larger than the sum of its proper divisors (1).

28707869 is an equidigital number, since it uses as much as digits as its factorization.

28707869 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 338688, while the sum is 47.

The square root of 28707869 is about 5357.9724710006. The cubic root of 28707869 is about 306.1965679932.

The spelling of 28707869 in words is "twenty-eight million, seven hundred seven thousand, eight hundred sixty-nine".