28644137 has 2 divisors, whose sum is σ = 28644138. Its totient is φ = 28644136.

The previous prime is 28644113. The next prime is 28644151. The reversal of 28644137 is 73144682.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15241216 + 13402921 = 3904^2 + 3661^2 .

It is a cyclic number.

It is not a de Polignac number, because 28644137 - 2⁶ = 28644073 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 28644097 and 28644106.

It is not a weakly prime, because it can be changed into another prime (28644107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14322068 + 14322069.

It is an arithmetic number, because the mean of its divisors is an integer number (14322069).

Almost surely, 2^28644137 is an apocalyptic number.

It is an amenable number.

28644137 is a deficient number, since it is larger than the sum of its proper divisors (1).

28644137 is an equidigital number, since it uses as much as digits as its factorization.

28644137 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32256, while the sum is 35.

The square root of 28644137 is about 5352.0217675193. The cubic root of 28644137 is about 305.9698127625.

The spelling of 28644137 in words is "twenty-eight million, six hundred forty-four thousand, one hundred thirty-seven".