28216908 has 18 divisors (see below), whose sum is σ = 71326164. Its totient is φ = 9405624.

The previous prime is 28216907. The next prime is 28216921. The reversal of 28216908 is 80961282.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 783803 = 28216908 / (2 + 8 + 2 + 1 + 6 + 9 + 0 + 8).

It is not an unprimeable number, because it can be changed into a prime (28216907) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 391866 + ... + 391937.

Almost surely, 2^28216908 is an apocalyptic number.

It is an amenable number.

28216908 is an abundant number, since it is smaller than the sum of its proper divisors (43109256).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28216908 is a wasteful number, since it uses less digits than its factorization.

28216908 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 783813 (or 783808 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The square root of 28216908 is about 5311.9589606848. The cubic root of 28216908 is about 304.4410006458.

The spelling of 28216908 in words is "twenty-eight million, two hundred sixteen thousand, nine hundred eight".