28221827 has 2 divisors, whose sum is σ = 28221828. Its totient is φ = 28221826.

The previous prime is 28221797. The next prime is 28221839. The reversal of 28221827 is 72812282.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28221827 - 2⁶ = 28221763 is a prime.

It is a Chen prime.

It is equal to p_1754339 and since 28221827 and 1754339 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 28221793 and 28221802.

It is not a weakly prime, because it can be changed into another prime (28221847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14110913 + 14110914.

It is an arithmetic number, because the mean of its divisors is an integer number (14110914).

Almost surely, 2^28221827 is an apocalyptic number.

28221827 is a deficient number, since it is larger than the sum of its proper divisors (1).

28221827 is an equidigital number, since it uses as much as digits as its factorization.

28221827 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7168, while the sum is 32.

The square root of 28221827 is about 5312.4219523679. The cubic root of 28221827 is about 304.4586904918.

The spelling of 28221827 in words is "twenty-eight million, two hundred twenty-one thousand, eight hundred twenty-seven".