28543648 has 48 divisors (see below), whose sum is σ = 65076480. Its totient is φ = 12070656.

The previous prime is 28543639. The next prime is 28543651. The reversal of 28543648 is 84634582.

It is a super-2 number, since 2×28543648² = 1629479682295808, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 28543648.

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 7 ways as a sum of consecutive naturals, for example, 16890 + ... + 18502.

It is an arithmetic number, because the mean of its divisors is an integer number (1355760).

Almost surely, 2^28543648 is an apocalyptic number.

28543648 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 28543648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32538240).

28543648 is an abundant number, since it is smaller than the sum of its proper divisors (36532832).

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

28543648 is a wasteful number, since it uses less digits than its factorization.

28543648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1709 (or 1701 counting only the distinct ones).

The product of its digits is 184320, while the sum is 40.

The square root of 28543648 is about 5342.6255717578. The cubic root of 28543648 is about 305.6115937233.

The spelling of 28543648 in words is "twenty-eight million, five hundred forty-three thousand, six hundred forty-eight".