28565051 has 4 divisors (see below), whose sum is σ = 28747152. Its totient is φ = 28382952.

The previous prime is 28565003. The next prime is 28565059. The reversal of 28565051 is 15056582.

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

It is a cyclic number.

It is not a de Polignac number, because 28565051 - 2²² = 24370747 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28564999 and 28565017.

It is not an unprimeable number, because it can be changed into a prime (28565059) 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 3 ways as a sum of consecutive naturals, for example, 90815 + ... + 91128.

It is an arithmetic number, because the mean of its divisors is an integer number (7186788).

Almost surely, 2^28565051 is an apocalyptic number.

28565051 is a deficient number, since it is larger than the sum of its proper divisors (182101).

28565051 is a wasteful number, since it uses less digits than its factorization.

28565051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182100.

The product of its (nonzero) digits is 12000, while the sum is 32.

The square root of 28565051 is about 5344.6282377730. The cubic root of 28565051 is about 305.6879606349.

The spelling of 28565051 in words is "twenty-eight million, five hundred sixty-five thousand, fifty-one".