1644000318 has 24 divisors (see below), whose sum is σ = 3562794768. Its totient is φ = 547877952.

The previous prime is 1644000311. The next prime is 1644000353. The reversal of 1644000318 is 8130004461.

1644000318 is a `hidden beast` number, since 1 + 644 + 0 + 0 + 0 + 3 + 18 = 666.

It is a super-2 number, since 2×1644000318² = 5405474091168202248, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1644000291 and 1644000300.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1644000311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 113271 + ... + 126957.

It is an arithmetic number, because the mean of its divisors is an integer number (148449782).

It is a vampire number, since it can be written as 40038 ⋅ 41061 (with its own digits).

Almost surely, 2^1644000318 is an apocalyptic number.

1644000318 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1644000318 is an abundant number, since it is smaller than the sum of its proper divisors (1918794450).

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

1644000318 is a wasteful number, since it uses less digits than its factorization.

1644000318 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20368 (or 20365 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 1644000318 is about 40546.2737868722. The cubic root of 1644000318 is about 1180.2317647795.

Adding to 1644000318 its reverse (8130004461), we get a palindrome (9774004779).

The spelling of 1644000318 in words is "one billion, six hundred forty-four million, three hundred eighteen", and thus it is an aban number.