43540213644 has 72 divisors (see below), whose sum is σ = 112676355792. Its totient is φ = 14168730240.

The previous prime is 43540213637. The next prime is 43540213649. The reversal of 43540213644 is 44631204534.

43540213644 is a `hidden beast` number, since 4 + 3 + 5 + 4 + 0 + 2 + 1 + 3 + 644 = 666.

43540213644 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 43540213599 and 43540213608.

It is not an unprimeable number, because it can be changed into a prime (43540213649) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3679882 + ... + 3691694.

It is an arithmetic number, because the mean of its divisors is an integer number (1564949386).

Almost surely, 2^43540213644 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 43540213644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (56338177896).

43540213644 is an abundant number, since it is smaller than the sum of its proper divisors (69136142148).

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

43540213644 is a wasteful number, since it uses less digits than its factorization.

43540213644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14247 (or 14242 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 36.

The spelling of 43540213644 in words is "forty-three billion, five hundred forty million, two hundred thirteen thousand, six hundred forty-four".