28817808 has 20 divisors (see below), whose sum is σ = 74446128. Its totient is φ = 9605920.

The previous prime is 28817807. The next prime is 28817809. The reversal of 28817808 is 80871882.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (28817807) and next prime (28817809).

It is a self number, because there is not a number n which added to its sum of digits gives 28817808.

It is not an unprimeable number, because it can be changed into a prime (28817807) 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, 300138 + ... + 300233.

Almost surely, 2^28817808 is an apocalyptic number.

It is an amenable number.

28817808 is an abundant number, since it is smaller than the sum of its proper divisors (45628320).

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

28817808 is a wasteful number, since it uses less digits than its factorization.

28817808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 600382 (or 600376 counting only the distinct ones).

The product of its (nonzero) digits is 57344, while the sum is 42.

The square root of 28817808 is about 5368.2220520392. Note that the first 3 decimals coincide. The cubic root of 28817808 is about 306.5869378956.

The spelling of 28817808 in words is "twenty-eight million, eight hundred seventeen thousand, eight hundred eight".