28135008 has 144 divisors (see below), whose sum is σ = 89159616. Its totient is φ = 8344320.

The previous prime is 28134989. The next prime is 28135013. The reversal of 28135008 is 80053182.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (144).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 262891 + ... + 262997.

It is an arithmetic number, because the mean of its divisors is an integer number (619164).

Almost surely, 2^28135008 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28135008, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44579808).

28135008 is an abundant number, since it is smaller than the sum of its proper divisors (61024608).

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

28135008 is a wasteful number, since it uses less digits than its factorization.

28135008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217 (or 206 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 28135008 is about 5304.2443382635. The cubic root of 28135008 is about 304.1461670136.

The spelling of 28135008 in words is "twenty-eight million, one hundred thirty-five thousand, eight".