28534240 has 96 divisors (see below), whose sum is σ = 78321600. Its totient is φ = 9621504.

The previous prime is 28534213. The next prime is 28534243. The reversal of 28534240 is 4243582.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a junction number, because it is equal to n+sod(n) for n = 28534199 and 28534208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28534243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 81586 + ... + 81934.

It is an arithmetic number, because the mean of its divisors is an integer number (815850).

Almost surely, 2^28534240 is an apocalyptic number.

28534240 is a gapful number since it is divisible by the number (20) 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 28534240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39160800).

28534240 is an abundant number, since it is smaller than the sum of its proper divisors (49787360).

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

28534240 is a wasteful number, since it uses less digits than its factorization.

28534240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 444 (or 436 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 28.

The square root of 28534240 is about 5341.7450332265. The cubic root of 28534240 is about 305.5780134580.

The spelling of 28534240 in words is "twenty-eight million, five hundred thirty-four thousand, two hundred forty".