28688244 has 48 divisors (see below), whose sum is σ = 72573312. Its totient is φ = 8767872.

The previous prime is 28688227. The next prime is 28688263. The reversal of 28688244 is 44288682.

It is a junction number, because it is equal to n+sod(n) for n = 28688196 and 28688205.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26457 + ... + 27519.

It is an arithmetic number, because the mean of its divisors is an integer number (1511944).

Almost surely, 2^28688244 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 28688244, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36286656).

28688244 is an abundant number, since it is smaller than the sum of its proper divisors (43885068).

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

28688244 is a wasteful number, since it uses less digits than its factorization.

28688244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1256 (or 1254 counting only the distinct ones).

The product of its digits is 196608, while the sum is 42.

The square root of 28688244 is about 5356.1407748490. The cubic root of 28688244 is about 306.1267790274.

The spelling of 28688244 in words is "twenty-eight million, six hundred eighty-eight thousand, two hundred forty-four".