28213307 has 2 divisors, whose sum is σ = 28213308. Its totient is φ = 28213306.

The previous prime is 28213279. The next prime is 28213313. The reversal of 28213307 is 70331282.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28213307 - 2²² = 24019003 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28213327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14106653 + 14106654.

It is an arithmetic number, because the mean of its divisors is an integer number (14106654).

Almost surely, 2^28213307 is an apocalyptic number.

28213307 is a deficient number, since it is larger than the sum of its proper divisors (1).

28213307 is an equidigital number, since it uses as much as digits as its factorization.

28213307 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 28213307 is about 5311.6199977031. The cubic root of 28213307 is about 304.4280493250.

Adding to 28213307 its reverse (70331282), we get a palindrome (98544589).

The spelling of 28213307 in words is "twenty-eight million, two hundred thirteen thousand, three hundred seven".