28475648 has 36 divisors (see below), whose sum is σ = 58247868. Its totient is φ = 13885440.

The previous prime is 28475591. The next prime is 28475669. The reversal of 28475648 is 84657482.

It can be written as a sum of positive squares in 2 ways, for example, as 15745024 + 12730624 = 3968^2 + 3568^2 .

It is a junction number, because it is equal to n+sod(n) for n = 28475599 and 28475608.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9140 + ... + 11852.

Almost surely, 2^28475648 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 28475648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29123934).

28475648 is an abundant number, since it is smaller than the sum of its proper divisors (29772220).

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

28475648 is an equidigital number, since it uses as much as digits as its factorization.

28475648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2770 (or 2756 counting only the distinct ones).

The product of its digits is 430080, while the sum is 44.

The square root of 28475648 is about 5336.2578648337. The cubic root of 28475648 is about 305.3687129135.

The spelling of 28475648 in words is "twenty-eight million, four hundred seventy-five thousand, six hundred forty-eight".