28801808 has 60 divisors (see below), whose sum is σ = 68764572. Its totient is φ = 11612160.

The previous prime is 28801783. The next prime is 28801813. The reversal of 28801808 is 80810882.

It can be written as a sum of positive squares in 2 ways, for example, as 20322064 + 8479744 = 4508^2 + 2912^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12248 + ... + 14408.

Almost surely, 2^28801808 is an apocalyptic number.

28801808 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28801808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34382286).

28801808 is an abundant number, since it is smaller than the sum of its proper divisors (39962764).

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

28801808 is a wasteful number, since it uses less digits than its factorization.

28801808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2200 (or 2187 counting only the distinct ones).

The product of its (nonzero) digits is 8192, while the sum is 35.

The square root of 28801808 is about 5366.7315938101. The cubic root of 28801808 is about 306.5301871170.

The spelling of 28801808 in words is "twenty-eight million, eight hundred one thousand, eight hundred eight".