28113649 has 4 divisors (see below), whose sum is σ = 28192320. Its totient is φ = 28034980.

The previous prime is 28113641. The next prime is 28113667. The reversal of 28113649 is 94631182.

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 a cyclic number.

It is not a de Polignac number, because 28113649 - 2³ = 28113641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28113641) 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, 38797 + ... + 39514.

It is an arithmetic number, because the mean of its divisors is an integer number (7048080).

Almost surely, 2^28113649 is an apocalyptic number.

It is an amenable number.

28113649 is a deficient number, since it is larger than the sum of its proper divisors (78671).

28113649 is an equidigital number, since it uses as much as digits as its factorization.

28113649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78670.

The product of its digits is 10368, while the sum is 34.

The square root of 28113649 is about 5302.2305683552. The cubic root of 28113649 is about 304.0691822292.

The spelling of 28113649 in words is "twenty-eight million, one hundred thirteen thousand, six hundred forty-nine".