28129648 has 20 divisors (see below), whose sum is σ = 56260288. Its totient is φ = 13610880.

The previous prime is 28129643. The next prime is 28129663. The reversal of 28129648 is 84692182.

28129648 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 28129648.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28129643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27861 + ... + 28852.

Almost surely, 2^28129648 is an apocalyptic number.

It is an amenable number.

28129648 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

28129648 is a wasteful number, since it uses less digits than its factorization.

28129648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56752 (or 56746 counting only the distinct ones).

The product of its digits is 55296, while the sum is 40.

The square root of 28129648 is about 5303.7390584379. The cubic root of 28129648 is about 304.1268514929.

It can be divided in two parts, 281 and 29648, that added together give a square (29929 = 173²).

The spelling of 28129648 in words is "twenty-eight million, one hundred twenty-nine thousand, six hundred forty-eight".