28396008 has 72 divisors (see below), whose sum is σ = 80007330. Its totient is φ = 9447840.

The previous prime is 28395989. The next prime is 28396019. The reversal of 28396008 is 80069382.

It can be written as a sum of positive squares in only one way, i.e., 25220484 + 3175524 = 5022^2 + 1782^2 .

It is a tau number, because it is divible by the number of its divisors (72).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 52218 + ... + 52758.

Almost surely, 2^28396008 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 28396008, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40003665).

28396008 is an abundant number, since it is smaller than the sum of its proper divisors (51611322).

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

28396008 is an frugal number, since it uses more digits than its factorization.

28396008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 571 (or 546 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 28396008 is about 5328.7904819011. The cubic root of 28396008 is about 305.0837645053.

The spelling of 28396008 in words is "twenty-eight million, three hundred ninety-six thousand, eight".