28156128 has 192 divisors, whose sum is σ = 99574272. Its totient is φ = 6727680.

The previous prime is 28156127. The next prime is 28156133. The reversal of 28156128 is 82165182.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28156123) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 95950 + ... + 96242.

It is an arithmetic number, because the mean of its divisors is an integer number (518616).

Almost surely, 2^28156128 is an apocalyptic number.

28156128 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28156128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (49787136).

28156128 is an abundant number, since it is smaller than the sum of its proper divisors (71418144).

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

28156128 is a wasteful number, since it uses less digits than its factorization.

28156128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 337 (or 329 counting only the distinct ones).

The product of its digits is 7680, while the sum is 33.

The square root of 28156128 is about 5306.2348232999. The cubic root of 28156128 is about 304.2222520627. Note that the first 4 decimals are identical.

The spelling of 28156128 in words is "twenty-eight million, one hundred fifty-six thousand, one hundred twenty-eight".