28808890 has 48 divisors (see below), whose sum is σ = 59036040. Its totient is φ = 10102400.

The previous prime is 28808867. The next prime is 28808893. The reversal of 28808890 is 9880882.

It can be written as a sum of positive squares in 4 ways, for example, as 20439441 + 8369449 = 4521^2 + 2893^2 .

It is not an unprimeable number, because it can be changed into a prime (28808893) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 34680 + ... + 35500.

Almost surely, 2^28808890 is an apocalyptic number.

28808890 is an abundant number, since it is smaller than the sum of its proper divisors (30227150).

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

28808890 is a wasteful number, since it uses less digits than its factorization.

28808890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 879 (or 868 counting only the distinct ones).

The product of its (nonzero) digits is 73728, while the sum is 43.

The square root of 28808890 is about 5367.3913589378. The cubic root of 28808890 is about 306.5553090223. Note that the first 3 decimals are identical.

The spelling of 28808890 in words is "twenty-eight million, eight hundred eight thousand, eight hundred ninety".