28312008 has 32 divisors (see below), whose sum is σ = 70915200. Its totient is φ = 9419328.

The previous prime is 28312007. The next prime is 28312019. The reversal of 28312008 is 80021382.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is not an unprimeable number, because it can be changed into a prime (28312003) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19185 + ... + 20607.

It is an arithmetic number, because the mean of its divisors is an integer number (2216100).

Almost surely, 2^28312008 is an apocalyptic number.

It is an amenable number.

28312008 is an abundant number, since it is smaller than the sum of its proper divisors (42603192).

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

28312008 is a wasteful number, since it uses less digits than its factorization.

28312008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2261 (or 2257 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 24.

The square root of 28312008 is about 5320.9029308943. The cubic root of 28312008 is about 304.7826382875.

The spelling of 28312008 in words is "twenty-eight million, three hundred twelve thousand, eight".