1644320050 has 12 divisors (see below), whose sum is σ = 3058435386. Its totient is φ = 657728000.

The previous prime is 1644320033. The next prime is 1644320057. The reversal of 1644320050 is 500234461.

It can be written as a sum of positive squares in 3 ways, for example, as 1440430209 + 203889841 = 37953^2 + 14279^2 .

It is a super-3 number, since 3×1644320050³ (a number of 29 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a junction number, because it is equal to n+sod(n) for n = 1644319997 and 1644320024.

It is not an unprimeable number, because it can be changed into a prime (1644320057) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 16443151 + ... + 16443250.

Almost surely, 2^1644320050 is an apocalyptic number.

1644320050 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1644320050 is a deficient number, since it is larger than the sum of its proper divisors (1414115336).

1644320050 is a wasteful number, since it uses less digits than its factorization.

1644320050 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32886413 (or 32886408 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 1644320050 is about 40550.2163989294. The cubic root of 1644320050 is about 1180.3082719427.

The spelling of 1644320050 in words is "one billion, six hundred forty-four million, three hundred twenty thousand, fifty".