144665540 has 12 divisors (see below), whose sum is σ = 303797676. Its totient is φ = 57866208.

The previous prime is 144665533. The next prime is 144665551. The reversal of 144665540 is 45566441.

It can be written as a sum of positive squares in 2 ways, for example, as 62980096 + 81685444 = 7936^2 + 9038^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 144665540.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3616619 + ... + 3616658.

It is an arithmetic number, because the mean of its divisors is an integer number (25316473).

Almost surely, 2^144665540 is an apocalyptic number.

144665540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

144665540 is an abundant number, since it is smaller than the sum of its proper divisors (159132136).

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

144665540 is a wasteful number, since it uses less digits than its factorization.

144665540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7233286 (or 7233284 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 35.

The square root of 144665540 is about 12027.6988655353. The cubic root of 144665540 is about 524.9545417934.

Subtracting from 144665540 its reverse (45566441), we obtain a palindrome (99099099).

The spelling of 144665540 in words is "one hundred forty-four million, six hundred sixty-five thousand, five hundred forty".