28890090 has 48 divisors (see below), whose sum is σ = 77711400. Its totient is φ = 7437696.

The previous prime is 28890079. The next prime is 28890091. The reversal of 28890090 is 9009882.

It can be written as a sum of positive squares in 4 ways, for example, as 17214201 + 11675889 = 4149^2 + 3417^2 .

It is not an unprimeable number, because it can be changed into a prime (28890091) 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, 2925 + ... + 8144.

Almost surely, 2^28890090 is an apocalyptic number.

28890090 is an abundant number, since it is smaller than the sum of its proper divisors (48821310).

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

28890090 is a wasteful number, since it uses less digits than its factorization.

28890090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11111 (or 11108 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 36.

The square root of 28890090 is about 5374.9502323277. The cubic root of 28890090 is about 306.8430551627.

The spelling of 28890090 in words is "twenty-eight million, eight hundred ninety thousand, ninety".