28044688 has 40 divisors (see below), whose sum is σ = 62416640. Its totient is φ = 11957760.

The previous prime is 28044617. The next prime is 28044691. The reversal of 28044688 is 88644082.

It is a self number, because there is not a number n which added to its sum of digits gives 28044688.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26473 + ... + 27511.

It is an arithmetic number, because the mean of its divisors is an integer number (1560416).

Almost surely, 2^28044688 is an apocalyptic number.

28044688 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 28044688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31208320).

28044688 is an abundant number, since it is smaller than the sum of its proper divisors (34371952).

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

28044688 is a wasteful number, since it uses less digits than its factorization.

28044688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1295 (or 1289 counting only the distinct ones).

The product of its (nonzero) digits is 98304, while the sum is 40.

The square root of 28044688 is about 5295.7235577398. The cubic root of 28044688 is about 303.8203578542.

The spelling of 28044688 in words is "twenty-eight million, forty-four thousand, six hundred eighty-eight".