28616213 has 2 divisors, whose sum is σ = 28616214. Its totient is φ = 28616212.

The previous prime is 28616201. The next prime is 28616267. The reversal of 28616213 is 31261682.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16176484 + 12439729 = 4022^2 + 3527^2 .

It is a cyclic number.

It is not a de Polignac number, because 28616213 - 2¹⁶ = 28550677 is a prime.

It is a super-2 number, since 2×28616213² = 1637775292922738, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28616513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14308106 + 14308107.

It is an arithmetic number, because the mean of its divisors is an integer number (14308107).

Almost surely, 2^28616213 is an apocalyptic number.

It is an amenable number.

28616213 is a deficient number, since it is larger than the sum of its proper divisors (1).

28616213 is an equidigital number, since it uses as much as digits as its factorization.

28616213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3456, while the sum is 29.

The square root of 28616213 is about 5349.4123976377. The cubic root of 28616213 is about 305.8703546090.

Adding to 28616213 its reverse (31261682), we get a palindrome (59877895).

The spelling of 28616213 in words is "twenty-eight million, six hundred sixteen thousand, two hundred thirteen".