28394507 has 2 divisors, whose sum is σ = 28394508. Its totient is φ = 28394506.

The previous prime is 28394501. The next prime is 28394521. The reversal of 28394507 is 70549382.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28394507 - 2²⁰ = 27345931 is a prime.

It is not a weakly prime, because it can be changed into another prime (28394501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14197253 + 14197254.

It is an arithmetic number, because the mean of its divisors is an integer number (14197254).

Almost surely, 2^28394507 is an apocalyptic number.

28394507 is a deficient number, since it is larger than the sum of its proper divisors (1).

28394507 is an equidigital number, since it uses as much as digits as its factorization.

28394507 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 60480, while the sum is 38.

The square root of 28394507 is about 5328.6496413257. The cubic root of 28394507 is about 305.0783888812.

The spelling of 28394507 in words is "twenty-eight million, three hundred ninety-four thousand, five hundred seven".