144247428 has 72 divisors (see below), whose sum is σ = 394955288. Its totient is φ = 44126208.

The previous prime is 144247409. The next prime is 144247429. The reversal of 144247428 is 824742441.

It can be written as a sum of positive squares in 4 ways, for example, as 1397124 + 142850304 = 1182^2 + 11952^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 144247392 and 144247401.

It is not an unprimeable number, because it can be changed into a prime (144247429) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 89526 + ... + 91122.

Almost surely, 2^144247428 is an apocalyptic number.

144247428 is a gapful number since it is divisible by the number (18) 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 144247428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (197477644).

144247428 is an abundant number, since it is smaller than the sum of its proper divisors (250707860).

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

144247428 is a wasteful number, since it uses less digits than its factorization.

144247428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1813 (or 1808 counting only the distinct ones).

The product of its digits is 57344, while the sum is 36.

The square root of 144247428 is about 12010.3050752260. The cubic root of 144247428 is about 524.4483129895.

Adding to 144247428 its reverse (824742441), we get a palindrome (968989869).

The spelling of 144247428 in words is "one hundred forty-four million, two hundred forty-seven thousand, four hundred twenty-eight".