28724207 has 2 divisors, whose sum is σ = 28724208. Its totient is φ = 28724206.

The previous prime is 28724183. The next prime is 28724221. The reversal of 28724207 is 70242782.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28724207 - 2¹⁴ = 28707823 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28720207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14362103 + 14362104.

It is an arithmetic number, because the mean of its divisors is an integer number (14362104).

Almost surely, 2^28724207 is an apocalyptic number.

28724207 is a deficient number, since it is larger than the sum of its proper divisors (1).

28724207 is an equidigital number, since it uses as much as digits as its factorization.

28724207 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12544, while the sum is 32.

The square root of 28724207 is about 5359.4968980306. The cubic root of 28724207 is about 306.2546437169.

Adding to 28724207 its reverse (70242782), we get a palindrome (98966989).

The spelling of 28724207 in words is "twenty-eight million, seven hundred twenty-four thousand, two hundred seven".