28043928 has 192 divisors, whose sum is σ = 90972000. Its totient is φ = 7983360.

The previous prime is 28043927. The next prime is 28043929. The reversal of 28043928 is 82934082.

It is an interprime number because it is at equal distance from previous prime (28043927) and next prime (28043929).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 28043892 and 28043901.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28043927) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 757926 + ... + 757962.

Almost surely, 2^28043928 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28043928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45486000).

28043928 is an abundant number, since it is smaller than the sum of its proper divisors (62928072).

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

28043928 is a wasteful number, since it uses less digits than its factorization.

28043928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103 (or 82 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 36.

The square root of 28043928 is about 5295.6518012422. The cubic root of 28043928 is about 303.8176133588.

The spelling of 28043928 in words is "twenty-eight million, forty-three thousand, nine hundred twenty-eight".