28560577 has 4 divisors (see below), whose sum is σ = 28632916. Its totient is φ = 28488240.

The previous prime is 28560551. The next prime is 28560589. The reversal of 28560577 is 77506582.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11553201 + 17007376 = 3399^2 + 4124^2 .

It is a cyclic number.

It is not a de Polignac number, because 28560577 - 2⁷ = 28560449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28560377) 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, 35574 + ... + 36367.

It is an arithmetic number, because the mean of its divisors is an integer number (7158229).

Almost surely, 2^28560577 is an apocalyptic number.

It is an amenable number.

28560577 is a deficient number, since it is larger than the sum of its proper divisors (72339).

28560577 is an equidigital number, since it uses as much as digits as its factorization.

28560577 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72338.

The product of its (nonzero) digits is 117600, while the sum is 40.

The square root of 28560577 is about 5344.2096702880. The cubic root of 28560577 is about 305.6720003467.

The spelling of 28560577 in words is "twenty-eight million, five hundred sixty thousand, five hundred seventy-seven".