6442043540 has 48 divisors (see below), whose sum is σ = 13758898944. Its totient is φ = 2533248000.

The previous prime is 6442043507. The next prime is 6442043599. The reversal of 6442043540 is 453402446.

It is a junction number, because it is equal to n+sod(n) for n = 6442043497 and 6442043506.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 281945 + ... + 303935.

It is an arithmetic number, because the mean of its divisors is an integer number (286643728).

Almost surely, 2^6442043540 is an apocalyptic number.

It is an amenable number.

6442043540 is an abundant number, since it is smaller than the sum of its proper divisors (7316855404).

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

6442043540 is a wasteful number, since it uses less digits than its factorization.

6442043540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22248 (or 22246 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 32.

The square root of 6442043540 is about 80262.3419792869. The cubic root of 6442043540 is about 1860.6922636115.

Adding to 6442043540 its reverse (453402446), we get a palindrome (6895445986).

The spelling of 6442043540 in words is "six billion, four hundred forty-two million, forty-three thousand, five hundred forty".