144065640 has 64 divisors (see below), whose sum is σ = 433900800. Its totient is φ = 38266112.

The previous prime is 144065557. The next prime is 144065641. The reversal of 144065640 is 46560441.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 144065598 and 144065607.

It is not an unprimeable number, because it can be changed into a prime (144065641) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30049 + ... + 34511.

It is an arithmetic number, because the mean of its divisors is an integer number (6779700).

Almost surely, 2^144065640 is an apocalyptic number.

144065640 is a gapful number since it is divisible by the number (10) 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 144065640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (216950400).

144065640 is an abundant number, since it is smaller than the sum of its proper divisors (289835160).

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

144065640 is a wasteful number, since it uses less digits than its factorization.

144065640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4746 (or 4742 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 30.

The square root of 144065640 is about 12002.7346883950. The cubic root of 144065640 is about 524.2279081628.

The spelling of 144065640 in words is "one hundred forty-four million, sixty-five thousand, six hundred forty".