28209208 has 8 divisors (see below), whose sum is σ = 52892280. Its totient is φ = 14104600.

The previous prime is 28209193. The next prime is 28209217. The reversal of 28209208 is 80290282.

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 28209208.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1763068 + ... + 1763083.

It is an arithmetic number, because the mean of its divisors is an integer number (6611535).

Almost surely, 2^28209208 is an apocalyptic number.

It is an amenable number.

28209208 is a deficient number, since it is larger than the sum of its proper divisors (24683072).

28209208 is a wasteful number, since it uses less digits than its factorization.

28209208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3526157 (or 3526153 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 31.

The square root of 28209208 is about 5311.2341315367. The cubic root of 28209208 is about 304.4133055611.

The spelling of 28209208 in words is "twenty-eight million, two hundred nine thousand, two hundred eight".