28440444 has 12 divisors (see below), whose sum is σ = 66361064. Its totient is φ = 9480144.

The previous prime is 28440427. The next prime is 28440449. The reversal of 28440444 is 44404482.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28440449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1185007 + ... + 1185030.

Almost surely, 2^28440444 is an apocalyptic number.

It is an amenable number.

28440444 is an abundant number, since it is smaller than the sum of its proper divisors (37920620).

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

28440444 is a wasteful number, since it uses less digits than its factorization.

28440444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2370044 (or 2370042 counting only the distinct ones).

The product of its (nonzero) digits is 16384, while the sum is 30.

The square root of 28440444 is about 5332.9582784792. The cubic root of 28440444 is about 305.2428201587.

The spelling of 28440444 in words is "twenty-eight million, four hundred forty thousand, four hundred forty-four".