28564387 has 2 divisors, whose sum is σ = 28564388. Its totient is φ = 28564386.

The previous prime is 28564381. The next prime is 28564397. The reversal of 28564387 is 78346582.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28564387 - 2³ = 28564379 is a prime.

It is not a weakly prime, because it can be changed into another prime (28564381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14282193 + 14282194.

It is an arithmetic number, because the mean of its divisors is an integer number (14282194).

Almost surely, 2^28564387 is an apocalyptic number.

28564387 is a deficient number, since it is larger than the sum of its proper divisors (1).

28564387 is an equidigital number, since it uses as much as digits as its factorization.

28564387 is an evil number, because the sum of its binary digits is even.

The product of its digits is 322560, while the sum is 43.

The square root of 28564387 is about 5344.5661189661. The cubic root of 28564387 is about 305.6855920251.

The spelling of 28564387 in words is "twenty-eight million, five hundred sixty-four thousand, three hundred eighty-seven".