28022231 has 2 divisors, whose sum is σ = 28022232. Its totient is φ = 28022230.

The previous prime is 28022221. The next prime is 28022237. The reversal of 28022231 is 13222082.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28022231 - 2⁶ = 28022167 is a prime.

It is a super-2 number, since 2×28022231² = 1570490860434722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28022237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14011115 + 14011116.

It is an arithmetic number, because the mean of its divisors is an integer number (14011116).

Almost surely, 2^28022231 is an apocalyptic number.

28022231 is a deficient number, since it is larger than the sum of its proper divisors (1).

28022231 is an equidigital number, since it uses as much as digits as its factorization.

28022231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 28022231 is about 5293.6028373878. The cubic root of 28022231 is about 303.7392407012.

The spelling of 28022231 in words is "twenty-eight million, twenty-two thousand, two hundred thirty-one".