28005567 has 4 divisors (see below), whose sum is σ = 37340760. Its totient is φ = 18670376.

The previous prime is 28005557. The next prime is 28005569. The reversal of 28005567 is 76550082.

It is a happy number.

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 28005567 - 2²³ = 19616959 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28005569) 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, 4667592 + ... + 4667597.

It is an arithmetic number, because the mean of its divisors is an integer number (9335190).

Almost surely, 2^28005567 is an apocalyptic number.

28005567 is a deficient number, since it is larger than the sum of its proper divisors (9335193).

28005567 is an equidigital number, since it uses as much as digits as its factorization.

28005567 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9335192.

The product of its (nonzero) digits is 16800, while the sum is 33.

The square root of 28005567 is about 5292.0286280405. The cubic root of 28005567 is about 303.6790204859.

The spelling of 28005567 in words is "twenty-eight million, five thousand, five hundred sixty-seven".