28638908 has 12 divisors (see below), whose sum is σ = 50210160. Its totient is φ = 14293152.

The previous prime is 28638893. The next prime is 28638923. The reversal of 28638908 is 80983682.

It is an interprime number because it is at equal distance from previous prime (28638893) and next prime (28638923).

It is a congruent number.

It is an unprimeable number.

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, 4016 + ... + 8567.

It is an arithmetic number, because the mean of its divisors is an integer number (4184180).

Almost surely, 2^28638908 is an apocalyptic number.

It is an amenable number.

28638908 is a deficient number, since it is larger than the sum of its proper divisors (21571252).

28638908 is a wasteful number, since it uses less digits than its factorization.

28638908 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13156 (or 13154 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 44.

The square root of 28638908 is about 5351.5332382412. The cubic root of 28638908 is about 305.9511933208.

The spelling of 28638908 in words is "twenty-eight million, six hundred thirty-eight thousand, nine hundred eight".