28961808 has 40 divisors (see below), whose sum is σ = 75286848. Its totient is φ = 9593472.

The previous prime is 28961783. The next prime is 28961809. The reversal of 28961808 is 80816982.

It is a self number, because there is not a number n which added to its sum of digits gives 28961808.

It is not an unprimeable number, because it can be changed into a prime (28961809) 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, 6210 + ... + 9822.

Almost surely, 2^28961808 is an apocalyptic number.

It is an amenable number.

28961808 is an abundant number, since it is smaller than the sum of its proper divisors (46325040).

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

28961808 is a wasteful number, since it uses less digits than its factorization.

28961808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3791 (or 3785 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 42.

The square root of 28961808 is about 5381.6176006848. The cubic root of 28961808 is about 307.0967521411.

The spelling of 28961808 in words is "twenty-eight million, nine hundred sixty-one thousand, eight hundred eight".