1644144834 has 64 divisors (see below), whose sum is σ = 3692977920. Its totient is φ = 485253120.

The previous prime is 1644144833. The next prime is 1644144847. The reversal of 1644144834 is 4384414461.

It is a super-3 number, since 3×1644144834³ (a number of 29 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1644144792 and 1644144801.

It is not an unprimeable number, because it can be changed into a prime (1644144833) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 137362 + ... + 148850.

It is an arithmetic number, because the mean of its divisors is an integer number (57702780).

Almost surely, 2^1644144834 is an apocalyptic number.

1644144834 is an abundant number, since it is smaller than the sum of its proper divisors (2048833086).

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

1644144834 is a wasteful number, since it uses less digits than its factorization.

1644144834 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11595.

The product of its digits is 147456, while the sum is 39.

The square root of 1644144834 is about 40548.0558596833. The cubic root of 1644144834 is about 1180.2663465603.

The spelling of 1644144834 in words is "one billion, six hundred forty-four million, one hundred forty-four thousand, eight hundred thirty-four".