28443240 has 96 divisors (see below), whose sum is σ = 105655680. Its totient is φ = 6500736.

The previous prime is 28443221. The next prime is 28443241. The reversal of 28443240 is 4234482.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (28443241) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3124 + ... + 8163.

It is an arithmetic number, because the mean of its divisors is an integer number (1100580).

Almost surely, 2^28443240 is an apocalyptic number.

28443240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28443240 is an abundant number, since it is smaller than the sum of its proper divisors (77212440).

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

28443240 is a wasteful number, since it uses less digits than its factorization.

28443240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11311 (or 11304 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 27.

The square root of 28443240 is about 5333.2204154713. The cubic root of 28443240 is about 305.2528227095.

It can be divided in two parts, 2844 and 3240, that added together give a square (6084 = 78²).

The spelling of 28443240 in words is "twenty-eight million, four hundred forty-three thousand, two hundred forty".