28809924 has 96 divisors (see below), whose sum is σ = 80231424. Its totient is φ = 7931520.

The previous prime is 28809901. The next prime is 28809929. The reversal of 28809924 is 42990882.

It is not an unprimeable number, because it can be changed into a prime (28809929) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 176667 + ... + 176829.

It is an arithmetic number, because the mean of its divisors is an integer number (835744).

Almost surely, 2^28809924 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 28809924, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40115712).

28809924 is an abundant number, since it is smaller than the sum of its proper divisors (51421500).

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

28809924 is a wasteful number, since it uses less digits than its factorization.

28809924 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 297 (or 295 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 42.

The square root of 28809924 is about 5367.4876804703. The cubic root of 28809924 is about 306.5589765753.

The spelling of 28809924 in words is "twenty-eight million, eight hundred nine thousand, nine hundred twenty-four".