28784207 has 2 divisors, whose sum is σ = 28784208. Its totient is φ = 28784206.

The previous prime is 28784167. The next prime is 28784227. The reversal of 28784207 is 70248782.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28784207 - 2⁶ = 28784143 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28784227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14392103 + 14392104.

It is an arithmetic number, because the mean of its divisors is an integer number (14392104).

Almost surely, 2^28784207 is an apocalyptic number.

28784207 is a deficient number, since it is larger than the sum of its proper divisors (1).

28784207 is an equidigital number, since it uses as much as digits as its factorization.

28784207 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 50176, while the sum is 38.

The square root of 28784207 is about 5365.0915183247. The cubic root of 28784207 is about 306.4677334310.

The spelling of 28784207 in words is "twenty-eight million, seven hundred eighty-four thousand, two hundred seven".