28528207 has 4 divisors (see below), whose sum is σ = 28568176. Its totient is φ = 28488240.

The previous prime is 28528189. The next prime is 28528231. The reversal of 28528207 is 70282582.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28528207 - 2⁷ = 28528079 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28528007) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18894 + ... + 20347.

It is an arithmetic number, because the mean of its divisors is an integer number (7142044).

Almost surely, 2^28528207 is an apocalyptic number.

28528207 is a deficient number, since it is larger than the sum of its proper divisors (39969).

28528207 is an equidigital number, since it uses as much as digits as its factorization.

28528207 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39968.

The product of its (nonzero) digits is 17920, while the sum is 34.

The square root of 28528207 is about 5341.1803002707. The cubic root of 28528207 is about 305.5564758001.

The spelling of 28528207 in words is "twenty-eight million, five hundred twenty-eight thousand, two hundred seven".