28564897 has 4 divisors (see below), whose sum is σ = 29033236. Its totient is φ = 28096560.

The previous prime is 28564891. The next prime is 28564951. The reversal of 28564897 is 79846582.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 79846582 = 2 ⋅39923291.

It can be written as a sum of positive squares in 2 ways, for example, as 781456 + 27783441 = 884^2 + 5271^2 .

It is a cyclic number.

It is not a de Polignac number, because 28564897 - 2³ = 28564889 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28564897.

It is not an unprimeable number, because it can be changed into a prime (28564891) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 234078 + ... + 234199.

It is an arithmetic number, because the mean of its divisors is an integer number (7258309).

Almost surely, 2^28564897 is an apocalyptic number.

It is an amenable number.

28564897 is a deficient number, since it is larger than the sum of its proper divisors (468339).

28564897 is an equidigital number, since it uses as much as digits as its factorization.

28564897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 468338.

The product of its digits is 967680, while the sum is 49.

The square root of 28564897 is about 5344.6138307646. The cubic root of 28564897 is about 305.6874112920.

The spelling of 28564897 in words is "twenty-eight million, five hundred sixty-four thousand, eight hundred ninety-seven".