28345128 has 48 divisors (see below), whose sum is σ = 82435680. Its totient is φ = 8098272.

The previous prime is 28345099. The next prime is 28345157. The reversal of 28345128 is 82154382.

It is an interprime number because it is at equal distance from previous prime (28345099) and next prime (28345157).

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10876 + ... + 13227.

It is an arithmetic number, because the mean of its divisors is an integer number (1717410).

Almost surely, 2^28345128 is an apocalyptic number.

28345128 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

28345128 is an abundant number, since it is smaller than the sum of its proper divisors (54090552).

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

28345128 is a wasteful number, since it uses less digits than its factorization.

28345128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24126 (or 24115 counting only the distinct ones).

The product of its digits is 15360, while the sum is 33.

The square root of 28345128 is about 5324.0142749621. The cubic root of 28345128 is about 304.9014390842.

The spelling of 28345128 in words is "twenty-eight million, three hundred forty-five thousand, one hundred twenty-eight".