28121827 has 2 divisors, whose sum is σ = 28121828. Its totient is φ = 28121826.

The previous prime is 28121803. The next prime is 28121857. The reversal of 28121827 is 72812182.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28121827 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28121857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14060913 + 14060914.

It is an arithmetic number, because the mean of its divisors is an integer number (14060914).

Almost surely, 2^28121827 is an apocalyptic number.

28121827 is a deficient number, since it is larger than the sum of its proper divisors (1).

28121827 is an equidigital number, since it uses as much as digits as its factorization.

28121827 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3584, while the sum is 31.

The square root of 28121827 is about 5303.0016971523. The cubic root of 28121827 is about 304.0986630067.

The spelling of 28121827 in words is "twenty-eight million, one hundred twenty-one thousand, eight hundred twenty-seven".