28938137 has 2 divisors, whose sum is σ = 28938138. Its totient is φ = 28938136.

The previous prime is 28938103. The next prime is 28938139. The reversal of 28938137 is 73183982.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20620681 + 8317456 = 4541^2 + 2884^2 .

It is a cyclic number.

It is not a de Polignac number, because 28938137 - 2⁶ = 28938073 is a prime.

Together with 28938139, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 28938094 and 28938103.

It is not a weakly prime, because it can be changed into another prime (28938139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14469068 + 14469069.

It is an arithmetic number, because the mean of its divisors is an integer number (14469069).

Almost surely, 2^28938137 is an apocalyptic number.

It is an amenable number.

28938137 is a deficient number, since it is larger than the sum of its proper divisors (1).

28938137 is an equidigital number, since it uses as much as digits as its factorization.

28938137 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 72576, while the sum is 41.

The square root of 28938137 is about 5379.4179053128. The cubic root of 28938137 is about 307.0130641273.

The spelling of 28938137 in words is "twenty-eight million, nine hundred thirty-eight thousand, one hundred thirty-seven".