28406928 has 120 divisors (see below), whose sum is σ = 82987744. Its totient is φ = 8363520.

The previous prime is 28406927. The next prime is 28406929. The reversal of 28406928 is 82960482.

It is an interprime number because it is at equal distance from previous prime (28406927) and next prime (28406929).

It is not an unprimeable number, because it can be changed into a prime (28406923) 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 23 ways as a sum of consecutive naturals, for example, 389100 + ... + 389172.

Almost surely, 2^28406928 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 28406928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41493872).

28406928 is an abundant number, since it is smaller than the sum of its proper divisors (54580816).

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

28406928 is a wasteful number, since it uses less digits than its factorization.

28406928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173 (or 156 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 39.

The square root of 28406928 is about 5329.8150061705. The cubic root of 28406928 is about 305.1228672757.

The spelling of 28406928 in words is "twenty-eight million, four hundred six thousand, nine hundred twenty-eight".