28001928 has 64 divisors (see below), whose sum is σ = 73566720. Its totient is φ = 8870400.

The previous prime is 28001927. The next prime is 28001951. The reversal of 28001928 is 82910082.

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 28001895 and 28001904.

It is not an unprimeable number, because it can be changed into a prime (28001921) 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 15 ways as a sum of consecutive naturals, for example, 45076 + ... + 45692.

It is an arithmetic number, because the mean of its divisors is an integer number (1149480).

Almost surely, 2^28001928 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 28001928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36783360).

28001928 is an abundant number, since it is smaller than the sum of its proper divisors (45564792).

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

28001928 is a wasteful number, since it uses less digits than its factorization.

28001928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 718 (or 714 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 30.

The square root of 28001928 is about 5291.6847978692. The cubic root of 28001928 is about 303.6658667223.

The spelling of 28001928 in words is "twenty-eight million, one thousand, nine hundred twenty-eight".