28045807 has 4 divisors (see below), whose sum is σ = 28095496. Its totient is φ = 27996120.

The previous prime is 28045747. The next prime is 28045811. The reversal of 28045807 is 70854082.

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 28045807 - 2⁷ = 28045679 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28045817) 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, 23988 + ... + 25129.

It is an arithmetic number, because the mean of its divisors is an integer number (7023874).

Almost surely, 2^28045807 is an apocalyptic number.

28045807 is a deficient number, since it is larger than the sum of its proper divisors (49689).

28045807 is an equidigital number, since it uses as much as digits as its factorization.

28045807 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49688.

The product of its (nonzero) digits is 17920, while the sum is 34.

The square root of 28045807 is about 5295.8292079711. The cubic root of 28045807 is about 303.8243986725.

Adding to 28045807 its reverse (70854082), we get a palindrome (98899889).

The spelling of 28045807 in words is "twenty-eight million, forty-five thousand, eight hundred seven".