28265819 has 4 divisors (see below), whose sum is σ = 28653096. Its totient is φ = 27878544.

The previous prime is 28265803. The next prime is 28265821. The reversal of 28265819 is 91856282.

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 28265819 - 2⁴ = 28265803 is a prime.

It is a super-2 number, since 2×28265819² = 1597913047481522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28265879) 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, 193529 + ... + 193674.

It is an arithmetic number, because the mean of its divisors is an integer number (7163274).

Almost surely, 2^28265819 is an apocalyptic number.

28265819 is a deficient number, since it is larger than the sum of its proper divisors (387277).

28265819 is an equidigital number, since it uses as much as digits as its factorization.

28265819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 387276.

The product of its digits is 69120, while the sum is 41.

The square root of 28265819 is about 5316.5608244428. The cubic root of 28265819 is about 304.6168044387.

The spelling of 28265819 in words is "twenty-eight million, two hundred sixty-five thousand, eight hundred nineteen".