28900128 has 48 divisors (see below), whose sum is σ = 77638176. Its totient is φ = 9408000.

The previous prime is 28900117. The next prime is 28900129. The reversal of 28900128 is 82100982.

It is a tau number, because it is divible by the number of its divisors (48).

It is a junction number, because it is equal to n+sod(n) for n = 28900095 and 28900104.

It is not an unprimeable number, because it can be changed into a prime (28900129) 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 7 ways as a sum of consecutive naturals, for example, 628 + ... + 7628.

It is an arithmetic number, because the mean of its divisors is an integer number (1617462).

Almost surely, 2^28900128 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 28900128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38819088).

28900128 is an abundant number, since it is smaller than the sum of its proper divisors (48738048).

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

28900128 is a wasteful number, since it uses less digits than its factorization.

28900128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7057 (or 7049 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 30.

The square root of 28900128 is about 5375.8839273184. The cubic root of 28900128 is about 306.8785890768.

The spelling of 28900128 in words is "twenty-eight million, nine hundred thousand, one hundred twenty-eight".