28438824 has 64 divisors (see below), whose sum is σ = 77077440. Its totient is φ = 8709120.

The previous prime is 28438799. The next prime is 28438831. The reversal of 28438824 is 42883482.

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

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16734 + ... + 18354.

It is an arithmetic number, because the mean of its divisors is an integer number (1204335).

Almost surely, 2^28438824 is an apocalyptic number.

28438824 is a gapful number since it is divisible by the number (24) 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 28438824, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38538720).

28438824 is an abundant number, since it is smaller than the sum of its proper divisors (48638616).

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

28438824 is a wasteful number, since it uses less digits than its factorization.

28438824 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1690 (or 1686 counting only the distinct ones).

The product of its digits is 98304, while the sum is 39.

The square root of 28438824 is about 5332.8063906352. The cubic root of 28438824 is about 305.2370243894.

The spelling of 28438824 in words is "twenty-eight million, four hundred thirty-eight thousand, eight hundred twenty-four".