28988928 has 120 divisors (see below), whose sum is σ = 87135048. Its totient is φ = 9621504.

The previous prime is 28988903. The next prime is 28988929. The reversal of 28988928 is 82988982.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a nude number because it is divisible by every one of its digits.

It is a nialpdrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28988929) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 124300 + ... + 124532.

Almost surely, 2^28988928 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 28988928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43567524).

28988928 is an abundant number, since it is smaller than the sum of its proper divisors (58146120).

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

28988928 is an frugal number, since it uses more digits than its factorization.

28988928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 266 (or 238 counting only the distinct ones).

The product of its digits is 1327104, while the sum is 54.

The square root of 28988928 is about 5384.1366996019. The cubic root of 28988928 is about 307.1925779457.

Adding to 28988928 its sum of digits (54), we get a palindrome (28988982).

The spelling of 28988928 in words is "twenty-eight million, nine hundred eighty-eight thousand, nine hundred twenty-eight".