28440144 has 120 divisors (see below), whose sum is σ = 86042112. Its totient is φ = 8743680.

The previous prime is 28440127. The next prime is 28440163. The reversal of 28440144 is 44104482.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 102534 + ... + 102810.

Almost surely, 2^28440144 is an apocalyptic number.

28440144 is a gapful number since it is divisible by the number (24) 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 28440144, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43021056).

28440144 is an abundant number, since it is smaller than the sum of its proper divisors (57601968).

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

28440144 is a wasteful number, since it uses less digits than its factorization.

28440144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 345 (or 336 counting only the distinct ones).

The product of its (nonzero) digits is 4096, while the sum is 27.

The square root of 28440144 is about 5332.9301514271. The cubic root of 28440144 is about 305.2417468847.

The spelling of 28440144 in words is "twenty-eight million, four hundred forty thousand, one hundred forty-four".