28107649 has 4 divisors (see below), whose sum is σ = 28638036. Its totient is φ = 27577264.

The previous prime is 28107643. The next prime is 28107661. The reversal of 28107649 is 94670182.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 94670182 = 2 ⋅47335091.

It can be written as a sum of positive squares in 2 ways, for example, as 9985600 + 18122049 = 3160^2 + 4257^2 .

It is a cyclic number.

It is not a de Polignac number, because 28107649 - 2⁵ = 28107617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28107643) 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, 265114 + ... + 265219.

It is an arithmetic number, because the mean of its divisors is an integer number (7159509).

Almost surely, 2^28107649 is an apocalyptic number.

It is an amenable number.

28107649 is a deficient number, since it is larger than the sum of its proper divisors (530387).

28107649 is an equidigital number, since it uses as much as digits as its factorization.

28107649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 530386.

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 28107649 is about 5301.6647385515. The cubic root of 28107649 is about 304.0475492625.

The spelling of 28107649 in words is "twenty-eight million, one hundred seven thousand, six hundred forty-nine".