28020207 has 4 divisors (see below), whose sum is σ = 37360280. Its totient is φ = 18680136.

The previous prime is 28020203. The next prime is 28020217. The reversal of 28020207 is 70202082.

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

It is not a de Polignac number, because 28020207 - 2² = 28020203 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 (28020203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4670032 + ... + 4670037.

It is an arithmetic number, because the mean of its divisors is an integer number (9340070).

Almost surely, 2^28020207 is an apocalyptic number.

28020207 is a deficient number, since it is larger than the sum of its proper divisors (9340073).

28020207 is an equidigital number, since it uses as much as digits as its factorization.

28020207 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9340072.

The product of its (nonzero) digits is 448, while the sum is 21.

The square root of 28020207 is about 5293.4116597899. The cubic root of 28020207 is about 303.7319276619.

Adding to 28020207 its reverse (70202082), we get a palindrome (98222289).

The spelling of 28020207 in words is "twenty-eight million, twenty thousand, two hundred seven".