28943424 has 84 divisors (see below), whose sum is σ = 83903820. Its totient is φ = 9538560.

The previous prime is 28943389. The next prime is 28943443. The reversal of 28943424 is 42434982.

It can be written as a sum of positive squares in 2 ways, for example, as 14745600 + 14197824 = 3840^2 + 3768^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 62554 + ... + 63014.

It is an arithmetic number, because the mean of its divisors is an integer number (998855).

Almost surely, 2^28943424 is an apocalyptic number.

28943424 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 28943424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41951910).

28943424 is an abundant number, since it is smaller than the sum of its proper divisors (54960396).

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

28943424 is a wasteful number, since it uses less digits than its factorization.

28943424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 588 (or 575 counting only the distinct ones).

The product of its digits is 55296, while the sum is 36.

The square root of 28943424 is about 5379.9092929156. The cubic root of 28943424 is about 307.0317600928.

The spelling of 28943424 in words is "twenty-eight million, nine hundred forty-three thousand, four hundred twenty-four".