1644140304 has 135 divisors (see below), whose sum is σ = 4798546389. Its totient is φ = 525502080.

The previous prime is 1644140293. The next prime is 1644140353. The reversal of 1644140304 is 4030414461.

The square root of 1644140304 is 40548.

It is a perfect power (a square), and thus also a powerful number.

1644140304 is a `hidden beast` number, since 1 + 644 + 14 + 0 + 3 + 0 + 4 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1145957904 + 498182400 = 33852^2 + 22320^2 .

It is a super-3 number, since 3×1644140304³ (a number of 29 digits) contains 333 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 15083802 + ... + 15083910.

Almost surely, 2^1644140304 is an apocalyptic number.

1644140304 is the 40548-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1644140304

1644140304 is an abundant number, since it is smaller than the sum of its proper divisors (3154406085).

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

1644140304 is a wasteful number, since it uses less digits than its factorization.

1644140304 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 294 (or 145 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 27.

The cubic root of 1644140304 is about 1180.2652625902.

Adding to 1644140304 its reverse (4030414461), we get a palindrome (5674554765).

The spelling of 1644140304 in words is "one billion, six hundred forty-four million, one hundred forty thousand, three hundred four".