28028207 has 8 divisors (see below), whose sum is σ = 28421280. Its totient is φ = 27637600.

The previous prime is 28028197. The next prime is 28028213. The reversal of 28028207 is 70282082.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28028207 - 2²² = 23833903 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28028207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28028227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35873 + ... + 36645.

It is an arithmetic number, because the mean of its divisors is an integer number (3552660).

Almost surely, 2^28028207 is an apocalyptic number.

28028207 is a deficient number, since it is larger than the sum of its proper divisors (393073).

28028207 is a wasteful number, since it uses less digits than its factorization.

28028207 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1233.

The product of its (nonzero) digits is 3584, while the sum is 29.

The square root of 28028207 is about 5294.1672621858. The cubic root of 28028207 is about 303.7608309008.

The spelling of 28028207 in words is "twenty-eight million, twenty-eight thousand, two hundred seven".