144640428 has 24 divisors (see below), whose sum is σ = 340773888. Its totient is φ = 47744976.

The previous prime is 144640421. The next prime is 144640439. The reversal of 144640428 is 824046441.

It is not an unprimeable number, because it can be changed into a prime (144640421) 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 7 ways as a sum of consecutive naturals, for example, 57276 + ... + 59747.

It is an arithmetic number, because the mean of its divisors is an integer number (14198912).

Almost surely, 2^144640428 is an apocalyptic number.

It is an amenable number.

144640428 is an abundant number, since it is smaller than the sum of its proper divisors (196133460).

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

144640428 is a wasteful number, since it uses less digits than its factorization.

144640428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117133 (or 117131 counting only the distinct ones).

The product of its (nonzero) digits is 24576, while the sum is 33.

The square root of 144640428 is about 12026.6548965205. The cubic root of 144640428 is about 524.9241650101.

Adding to 144640428 its reverse (824046441), we get a palindrome (968686869).

The spelling of 144640428 in words is "one hundred forty-four million, six hundred forty thousand, four hundred twenty-eight".