28205908 has 12 divisors (see below), whose sum is σ = 50952832. Its totient is φ = 13647960.

The previous prime is 28205897. The next prime is 28205921. The reversal of 28205908 is 80950282.

It is a super-2 number, since 2×28205908² = 1591146492208928, which contains 22 as substring.

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 113610 + ... + 113857.

Almost surely, 2^28205908 is an apocalyptic number.

It is an amenable number.

28205908 is a deficient number, since it is larger than the sum of its proper divisors (22746924).

28205908 is a wasteful number, since it uses less digits than its factorization.

28205908 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 227502 (or 227500 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 34.

The square root of 28205908 is about 5310.9234601903. The cubic root of 28205908 is about 304.4014346963.

The spelling of 28205908 in words is "twenty-eight million, two hundred five thousand, nine hundred eight".