28030128 has 40 divisors (see below), whose sum is σ = 82756608. Its totient is φ = 8008512.

The previous prime is 28030099. The next prime is 28030193. The reversal of 28030128 is 82103082.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a junction number, because it is equal to n+sod(n) for n = 28030098 and 28030107.

It is an unprimeable number.

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, 41376 + ... + 42047.

Almost surely, 2^28030128 is an apocalyptic number.

28030128 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

28030128 is an abundant number, since it is smaller than the sum of its proper divisors (54726480).

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

28030128 is a wasteful number, since it uses less digits than its factorization.

28030128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83441 (or 83435 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 24.

The square root of 28030128 is about 5294.3486851548. The cubic root of 28030128 is about 303.7677704721.

The spelling of 28030128 in words is "twenty-eight million, thirty thousand, one hundred twenty-eight".