28751207 has 2 divisors, whose sum is σ = 28751208. Its totient is φ = 28751206.

The previous prime is 28751201. The next prime is 28751243. The reversal of 28751207 is 70215782.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28751207 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28751201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14375603 + 14375604.

It is an arithmetic number, because the mean of its divisors is an integer number (14375604).

Almost surely, 2^28751207 is an apocalyptic number.

28751207 is a deficient number, since it is larger than the sum of its proper divisors (1).

28751207 is an equidigital number, since it uses as much as digits as its factorization.

28751207 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7840, while the sum is 32.

The square root of 28751207 is about 5362.0151995309. The cubic root of 28751207 is about 306.3505707735.

Adding to 28751207 its reverse (70215782), we get a palindrome (98966989).

The spelling of 28751207 in words is "twenty-eight million, seven hundred fifty-one thousand, two hundred seven".