28084240 has 20 divisors (see below), whose sum is σ = 65296044. Its totient is φ = 11233664.

The previous prime is 28084237. The next prime is 28084247. The reversal of 28084240 is 4248082.

It can be written as a sum of positive squares in 2 ways, for example, as 13307904 + 14776336 = 3648^2 + 3844^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a junction number, because it is equal to n+sod(n) for n = 28084199 and 28084208.

It is not an unprimeable number, because it can be changed into a prime (28084247) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 175447 + ... + 175606.

Almost surely, 2^28084240 is an apocalyptic number.

28084240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28084240 is an abundant number, since it is smaller than the sum of its proper divisors (37211804).

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

28084240 is a wasteful number, since it uses less digits than its factorization.

28084240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 351066 (or 351060 counting only the distinct ones).

The product of its (nonzero) digits is 4096, while the sum is 28.

The square root of 28084240 is about 5299.4565759142. The cubic root of 28084240 is about 303.9631187945.

The spelling of 28084240 in words is "twenty-eight million, eighty-four thousand, two hundred forty".