28507907 has 2 divisors, whose sum is σ = 28507908. Its totient is φ = 28507906.

The previous prime is 28507901. The next prime is 28507909. The reversal of 28507907 is 70970582.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28507907 - 2⁴ = 28507891 is a prime.

Together with 28507909, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28507901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14253953 + 14253954.

It is an arithmetic number, because the mean of its divisors is an integer number (14253954).

Almost surely, 2^28507907 is an apocalyptic number.

28507907 is a deficient number, since it is larger than the sum of its proper divisors (1).

28507907 is an equidigital number, since it uses as much as digits as its factorization.

28507907 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 35280, while the sum is 38.

The square root of 28507907 is about 5339.2796330591. The cubic root of 28507907 is about 305.4839830062.

The spelling of 28507907 in words is "twenty-eight million, five hundred seven thousand, nine hundred seven".