28564397 has 2 divisors, whose sum is σ = 28564398. Its totient is φ = 28564396.

The previous prime is 28564387. The next prime is 28564421. The reversal of 28564397 is 79346582.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25694761 + 2869636 = 5069^2 + 1694^2 .

It is a cyclic number.

It is not a de Polignac number, because 28564397 - 2⁴ = 28564381 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28564337) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14282198 + 14282199.

It is an arithmetic number, because the mean of its divisors is an integer number (14282199).

Almost surely, 2^28564397 is an apocalyptic number.

It is an amenable number.

28564397 is a deficient number, since it is larger than the sum of its proper divisors (1).

28564397 is an equidigital number, since it uses as much as digits as its factorization.

28564397 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 362880, while the sum is 44.

The square root of 28564397 is about 5344.5670544956. The cubic root of 28564397 is about 305.6856276973.

The spelling of 28564397 in words is "twenty-eight million, five hundred sixty-four thousand, three hundred ninety-seven".