28936213 has 2 divisors, whose sum is σ = 28936214. Its totient is φ = 28936212.

The previous prime is 28936177. The next prime is 28936217. The reversal of 28936213 is 31263982.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22972849 + 5963364 = 4793^2 + 2442^2 .

It is a cyclic number.

It is not a de Polignac number, because 28936213 - 2⁹ = 28935701 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28936217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14468106 + 14468107.

It is an arithmetic number, because the mean of its divisors is an integer number (14468107).

Almost surely, 2^28936213 is an apocalyptic number.

It is an amenable number.

28936213 is a deficient number, since it is larger than the sum of its proper divisors (1).

28936213 is an equidigital number, since it uses as much as digits as its factorization.

28936213 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15552, while the sum is 34.

The square root of 28936213 is about 5379.2390725827. The cubic root of 28936213 is about 307.0062598857.

The spelling of 28936213 in words is "twenty-eight million, nine hundred thirty-six thousand, two hundred thirteen".