28022440 has 16 divisors (see below), whose sum is σ = 63050580. Its totient is φ = 11208960.

The previous prime is 28022413. The next prime is 28022447. The reversal of 28022440 is 4422082.

It can be written as a sum of positive squares in 2 ways, for example, as 26894596 + 1127844 = 5186^2 + 1062^2 .

It is not an unprimeable number, because it can be changed into a prime (28022447) 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 3 ways as a sum of consecutive naturals, for example, 350241 + ... + 350320.

Almost surely, 2^28022440 is an apocalyptic number.

28022440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28022440 is an abundant number, since it is smaller than the sum of its proper divisors (35028140).

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

28022440 is a wasteful number, since it uses less digits than its factorization.

28022440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 700572 (or 700568 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 22.

The square root of 28022440 is about 5293.6225781595. The cubic root of 28022440 is about 303.7399958319.

The spelling of 28022440 in words is "twenty-eight million, twenty-two thousand, four hundred forty".