28560657 has 4 divisors (see below), whose sum is σ = 38080880. Its totient is φ = 19040436.

The previous prime is 28560619. The next prime is 28560671. The reversal of 28560657 is 75606582.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 28560657 - 2¹⁶ = 28495121 is a prime.

It is a super-2 number, since 2×28560657² = 1631422256543298, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28561657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4760107 + ... + 4760112.

It is an arithmetic number, because the mean of its divisors is an integer number (9520220).

Almost surely, 2^28560657 is an apocalyptic number.

It is an amenable number.

28560657 is a deficient number, since it is larger than the sum of its proper divisors (9520223).

28560657 is an equidigital number, since it uses as much as digits as its factorization.

28560657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9520222.

The product of its (nonzero) digits is 100800, while the sum is 39.

The square root of 28560657 is about 5344.2171550191. The cubic root of 28560657 is about 305.6722857487.

The spelling of 28560657 in words is "twenty-eight million, five hundred sixty thousand, six hundred fifty-seven".