28240128 has 216 divisors, whose sum is σ = 99485568. Its totient is φ = 7520256.

The previous prime is 28240117. The next prime is 28240153. The reversal of 28240128 is 82104282.

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 23 ways as a sum of consecutive naturals, for example, 274125 + ... + 274227.

Almost surely, 2^28240128 is an apocalyptic number.

28240128 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 28240128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (49742784).

28240128 is an abundant number, since it is smaller than the sum of its proper divisors (71245440).

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

28240128 is a wasteful number, since it uses less digits than its factorization.

28240128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149 (or 132 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 27.

The square root of 28240128 is about 5314.1441455798. The cubic root of 28240128 is about 304.5244870178.

The spelling of 28240128 in words is "twenty-eight million, two hundred forty thousand, one hundred twenty-eight".