28355213 has 2 divisors, whose sum is σ = 28355214. Its totient is φ = 28355212.

The previous prime is 28355161. The next prime is 28355221. The reversal of 28355213 is 31255382.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20187049 + 8168164 = 4493^2 + 2858^2 .

It is a cyclic number.

It is not a de Polignac number, because 28355213 - 2⁸ = 28354957 is a prime.

It is equal to p_1762175 and since 28355213 and 1762175 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28355263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14177606 + 14177607.

It is an arithmetic number, because the mean of its divisors is an integer number (14177607).

Almost surely, 2^28355213 is an apocalyptic number.

It is an amenable number.

28355213 is a deficient number, since it is larger than the sum of its proper divisors (1).

28355213 is an equidigital number, since it uses as much as digits as its factorization.

28355213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7200, while the sum is 29.

The square root of 28355213 is about 5324.9613144135. The cubic root of 28355213 is about 304.9375954024.

The spelling of 28355213 in words is "twenty-eight million, three hundred fifty-five thousand, two hundred thirteen".