28689552 has 120 divisors (see below), whose sum is σ = 85577856. Its totient is φ = 9300096.

The previous prime is 28689527. The next prime is 28689559. The reversal of 28689552 is 25598682.

It is a junction number, because it is equal to n+sod(n) for n = 28689498 and 28689507.

It is not an unprimeable number, because it can be changed into a prime (28689559) 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, 182658 + ... + 182814.

Almost surely, 2^28689552 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 28689552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42788928).

28689552 is an abundant number, since it is smaller than the sum of its proper divisors (56888304).

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

28689552 is a wasteful number, since it uses less digits than its factorization.

28689552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 227 (or 209 counting only the distinct ones).

The product of its digits is 345600, while the sum is 45.

The square root of 28689552 is about 5356.2628762972. The cubic root of 28689552 is about 306.1314314295.

It can be divided in two parts, 28689 and 552, that added together give a square (29241 = 171²).

The spelling of 28689552 in words is "twenty-eight million, six hundred eighty-nine thousand, five hundred fifty-two".