28265613 has 4 divisors (see below), whose sum is σ = 37687488. Its totient is φ = 18843740.

The previous prime is 28265609. The next prime is 28265617. The reversal of 28265613 is 31656282.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (28265609) and next prime (28265617).

It is a cyclic number.

It is not a de Polignac number, because 28265613 - 2² = 28265609 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28265617) 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, 4710933 + ... + 4710938.

It is an arithmetic number, because the mean of its divisors is an integer number (9421872).

Almost surely, 2^28265613 is an apocalyptic number.

It is an amenable number.

28265613 is a deficient number, since it is larger than the sum of its proper divisors (9421875).

28265613 is an equidigital number, since it uses as much as digits as its factorization.

28265613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9421874.

The product of its digits is 17280, while the sum is 33.

The square root of 28265613 is about 5316.5414509811. The cubic root of 28265613 is about 304.6160644258.

The spelling of 28265613 in words is "twenty-eight million, two hundred sixty-five thousand, six hundred thirteen".