43544543644 has 72 divisors (see below), whose sum is σ = 94466856960. Its totient is φ = 17470674144.

The previous prime is 43544543629. The next prime is 43544543671. The reversal of 43544543644 is 44634544534.

It is a super-2 number, since 2×43544543644² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (46).

It is a junction number, because it is equal to n+sod(n) for n = 43544543594 and 43544543603.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 109117 + ... + 314635.

It is an arithmetic number, because the mean of its divisors is an integer number (1312039680).

Almost surely, 2^43544543644 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 43544543644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (47233428480).

43544543644 is an abundant number, since it is smaller than the sum of its proper divisors (50922313316).

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

43544543644 is a wasteful number, since it uses less digits than its factorization.

43544543644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 205607 (or 205598 counting only the distinct ones).

The product of its digits is 5529600, while the sum is 46.

The spelling of 43544543644 in words is "forty-three billion, five hundred forty-four million, five hundred forty-three thousand, six hundred forty-four".