28000507 has 2 divisors, whose sum is σ = 28000508. Its totient is φ = 28000506.

The previous prime is 28000477. The next prime is 28000541. The reversal of 28000507 is 70500082.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28000507 - 2¹¹ = 27998459 is a prime.

It is not a weakly prime, because it can be changed into another prime (28000597) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14000253 + 14000254.

It is an arithmetic number, because the mean of its divisors is an integer number (14000254).

Almost surely, 2^28000507 is an apocalyptic number.

28000507 is a deficient number, since it is larger than the sum of its proper divisors (1).

28000507 is an equidigital number, since it uses as much as digits as its factorization.

28000507 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 560, while the sum is 22.

The square root of 28000507 is about 5291.5505289093. The cubic root of 28000507 is about 303.6607299748.

Adding to 28000507 its reverse (70500082), we get a palindrome (98500589).

The spelling of 28000507 in words is "twenty-eight million, five hundred seven", and thus it is an aban number.