28313969 has 2 divisors, whose sum is σ = 28313970. Its totient is φ = 28313968.

The previous prime is 28313963. The next prime is 28313977. The reversal of 28313969 is 96931382.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16321600 + 11992369 = 4040^2 + 3463^2 .

It is a cyclic number.

It is not a de Polignac number, because 28313969 - 2²⁰ = 27265393 is a prime.

It is a super-2 number, since 2×28313969² = 1603361681065922, 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 (28313963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14156984 + 14156985.

It is an arithmetic number, because the mean of its divisors is an integer number (14156985).

Almost surely, 2^28313969 is an apocalyptic number.

It is an amenable number.

28313969 is a deficient number, since it is larger than the sum of its proper divisors (1).

28313969 is an equidigital number, since it uses as much as digits as its factorization.

28313969 is an evil number, because the sum of its binary digits is even.

The product of its digits is 69984, while the sum is 41.

The square root of 28313969 is about 5321.0872009393. The cubic root of 28313969 is about 304.7896749361.

The spelling of 28313969 in words is "twenty-eight million, three hundred thirteen thousand, nine hundred sixty-nine".