28123937 has 2 divisors, whose sum is σ = 28123938. Its totient is φ = 28123936.

The previous prime is 28123897. The next prime is 28123993. The reversal of 28123937 is 73932182.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17986081 + 10137856 = 4241^2 + 3184^2 .

It is a cyclic number.

It is not a de Polignac number, because 28123937 - 2⁶ = 28123873 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 28123897 and 28123906.

It is not a weakly prime, because it can be changed into another prime (28128937) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14061968 + 14061969.

It is an arithmetic number, because the mean of its divisors is an integer number (14061969).

Almost surely, 2^28123937 is an apocalyptic number.

It is an amenable number.

28123937 is a deficient number, since it is larger than the sum of its proper divisors (1).

28123937 is an equidigital number, since it uses as much as digits as its factorization.

28123937 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18144, while the sum is 35.

The square root of 28123937 is about 5303.2006373510. The cubic root of 28123937 is about 304.1062683937.

The spelling of 28123937 in words is "twenty-eight million, one hundred twenty-three thousand, nine hundred thirty-seven".