28331128 has 32 divisors (see below), whose sum is σ = 63907200. Its totient is φ = 11502432.

The previous prime is 28331113. The next prime is 28331141. The reversal of 28331128 is 82113382.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a junction number, because it is equal to n+sod(n) for n = 28331096 and 28331105.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12250 + ... + 14377.

It is an arithmetic number, because the mean of its divisors is an integer number (1997100).

Almost surely, 2^28331128 is an apocalyptic number.

28331128 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

28331128 is an abundant number, since it is smaller than the sum of its proper divisors (35576072).

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

28331128 is a wasteful number, since it uses less digits than its factorization.

28331128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26659 (or 26655 counting only the distinct ones).

The product of its digits is 2304, while the sum is 28.

The square root of 28331128 is about 5322.6993151971. The cubic root of 28331128 is about 304.8512326535.

The spelling of 28331128 in words is "twenty-eight million, three hundred thirty-one thousand, one hundred twenty-eight".