28508207 has 16 divisors (see below), whose sum is σ = 35212800. Its totient is φ = 22475232.

The previous prime is 28508197. The next prime is 28508209. The reversal of 28508207 is 70280582.

It is not a de Polignac number, because 28508207 - 2⁴ = 28508191 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28508209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47294 + ... + 47892.

It is an arithmetic number, because the mean of its divisors is an integer number (2200800).

Almost surely, 2^28508207 is an apocalyptic number.

28508207 is a deficient number, since it is larger than the sum of its proper divisors (6704593).

28508207 is a wasteful number, since it uses less digits than its factorization.

28508207 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1142.

The product of its (nonzero) digits is 8960, while the sum is 32.

The square root of 28508207 is about 5339.3077266627. The cubic root of 28508207 is about 305.4850545787.

Adding to 28508207 its reverse (70280582), we get a palindrome (98788789).

The spelling of 28508207 in words is "twenty-eight million, five hundred eight thousand, two hundred seven".