540644 has 24 divisors (see below), whose sum is σ = 1050168. Its totient is φ = 241920.

The previous prime is 540629. The next prime is 540677. The reversal of 540644 is 446045.

540644 = 7² + 8² + ... + 117².

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 131044 + 409600 = 362^2 + 640^2 .

It is an unprimeable number.

540644 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1784 + ... + 2064.

It is an arithmetic number, because the mean of its divisors is an integer number (43757).

2⁵⁴⁰⁶⁴⁴ is an apocalyptic number.

It is an amenable number.

540644 is a deficient number, since it is larger than the sum of its proper divisors (509524).

540644 is a wasteful number, since it uses less digits than its factorization.

540644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 335 (or 333 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 23.

The square root of 540644 is about 735.2849787667. The cubic root of 540644 is about 81.4648875809.

Adding to 540644 its reverse (446045), we get a palindrome (986689).

The spelling of 540644 in words is "five hundred forty thousand, six hundred forty-four".