28191008 has 24 divisors (see below), whose sum is σ = 57915648. Its totient is φ = 13482304.

The previous prime is 28191001. The next prime is 28191011. The reversal of 28191008 is 80019182.

It is not an unprimeable number, because it can be changed into a prime (28191001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18416 + ... + 19887.

It is an arithmetic number, because the mean of its divisors is an integer number (2413152).

Almost surely, 2^28191008 is an apocalyptic number.

It is an amenable number.

28191008 is an abundant number, since it is smaller than the sum of its proper divisors (29724640).

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

28191008 is a wasteful number, since it uses less digits than its factorization.

28191008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38336 (or 38328 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 29.

The square root of 28191008 is about 5309.5205056577. The cubic root of 28191008 is about 304.3478244117.

The spelling of 28191008 in words is "twenty-eight million, one hundred ninety-one thousand, eight".