28568537 has 8 divisors (see below), whose sum is σ = 29412936. Its totient is φ = 27735552.

The previous prime is 28568503. The next prime is 28568543. The reversal of 28568537 is 73586582.

It can be written as a sum of positive squares in 4 ways, for example, as 13366336 + 15202201 = 3656^2 + 3899^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28568537 - 2¹⁸ = 28306393 is a prime.

It is a super-2 number, since 2×28568537² = 1632322612640738, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28568597) 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 in 7 ways as a sum of consecutive naturals, for example, 2363 + ... + 7919.

It is an arithmetic number, because the mean of its divisors is an integer number (3676617).

Almost surely, 2^28568537 is an apocalyptic number.

It is an amenable number.

28568537 is a deficient number, since it is larger than the sum of its proper divisors (844399).

28568537 is an equidigital number, since it uses as much as digits as its factorization.

28568537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5707.

The product of its digits is 403200, while the sum is 44.

The square root of 28568537 is about 5344.9543496647. The cubic root of 28568537 is about 305.7003952342.

The spelling of 28568537 in words is "twenty-eight million, five hundred sixty-eight thousand, five hundred thirty-seven".