28890032 has 60 divisors (see below), whose sum is σ = 61562280. Its totient is φ = 13095936.

The previous prime is 28890031. The next prime is 28890053. The reversal of 28890032 is 23009882.

It is a happy number.

It is a super-2 number, since 2×28890032² = 1669267897922048, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28890031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 255608 + ... + 255720.

It is an arithmetic number, because the mean of its divisors is an integer number (1026038).

Almost surely, 2^28890032 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28890032, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30781140).

28890032 is an abundant number, since it is smaller than the sum of its proper divisors (32672248).

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

28890032 is a wasteful number, since it uses less digits than its factorization.

28890032 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198 (or 163 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 28890032 is about 5374.9448369262. The cubic root of 28890032 is about 306.8428498223.

The spelling of 28890032 in words is "twenty-eight million, eight hundred ninety thousand, thirty-two".