28327121 has 2 divisors, whose sum is σ = 28327122. Its totient is φ = 28327120.

The previous prime is 28327097. The next prime is 28327127. The reversal of 28327121 is 12172382.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16000000 + 12327121 = 4000^2 + 3511^2 .

It is a cyclic number.

It is not a de Polignac number, because 28327121 - 2²² = 24132817 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28327127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14163560 + 14163561.

It is an arithmetic number, because the mean of its divisors is an integer number (14163561).

Almost surely, 2^28327121 is an apocalyptic number.

It is an amenable number.

28327121 is a deficient number, since it is larger than the sum of its proper divisors (1).

28327121 is an equidigital number, since it uses as much as digits as its factorization.

28327121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1344, while the sum is 26.

The square root of 28327121 is about 5322.3228951277. The cubic root of 28327121 is about 304.8368598114.

The spelling of 28327121 in words is "twenty-eight million, three hundred twenty-seven thousand, one hundred twenty-one".