43643128536 has 192 divisors, whose sum is σ = 144609454080. Its totient is φ = 12067107840.

The previous prime is 43643128531. The next prime is 43643128553. The reversal of 43643128536 is 63582134634.

43643128536 is a `hidden beast` number, since 4 + 3 + 64 + 31 + 28 + 536 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 43643128491 and 43643128500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43643128531) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 370120 + ... + 473576.

It is an arithmetic number, because the mean of its divisors is an integer number (753174240).

Almost surely, 2^43643128536 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 43643128536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (72304727040).

43643128536 is an abundant number, since it is smaller than the sum of its proper divisors (100966325544).

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

43643128536 is a wasteful number, since it uses less digits than its factorization.

43643128536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103516 (or 103500 counting only the distinct ones).

The product of its digits is 1244160, while the sum is 45.

It can be divided in two parts, 4364 and 3128536, that added together give a square (3132900 = 1770²).

The spelling of 43643128536 in words is "forty-three billion, six hundred forty-three million, one hundred twenty-eight thousand, five hundred thirty-six".