28910205 has 24 divisors (see below), whose sum is σ = 50424192. Its totient is φ = 15322464.

The previous prime is 28910201. The next prime is 28910221. The reversal of 28910205 is 50201982.

It is not a de Polignac number, because 28910205 - 2² = 28910201 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28910201) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5592 + ... + 9438.

It is an arithmetic number, because the mean of its divisors is an integer number (2101008).

Almost surely, 2^28910205 is an apocalyptic number.

It is an amenable number.

28910205 is a deficient number, since it is larger than the sum of its proper divisors (21513987).

28910205 is a wasteful number, since it uses less digits than its factorization.

28910205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4025 (or 4022 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 28910205 is about 5376.8210868505. The cubic root of 28910205 is about 306.9142527733.

The spelling of 28910205 in words is "twenty-eight million, nine hundred ten thousand, two hundred five".