6542840738 has 24 divisors (see below), whose sum is σ = 11446004700. Its totient is φ = 2796849888.

The previous prime is 6542840723. The next prime is 6542840743. The reversal of 6542840738 is 8370482456.

It can be written as a sum of positive squares in 2 ways, for example, as 6537854449 + 4986289 = 80857^2 + 2233^2 .

It is a junction number, because it is equal to n+sod(n) for n = 6542840692 and 6542840701.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 47693 + ... + 123936.

Almost surely, 2^6542840738 is an apocalyptic number.

6542840738 is a deficient number, since it is larger than the sum of its proper divisors (4903163962).

6542840738 is a wasteful number, since it uses less digits than its factorization.

6542840738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172034 (or 172027 counting only the distinct ones).

The product of its (nonzero) digits is 1290240, while the sum is 47.

The square root of 6542840738 is about 80887.8281201813. The cubic root of 6542840738 is about 1870.3466940866.

The spelling of 6542840738 in words is "six billion, five hundred forty-two million, eight hundred forty thousand, seven hundred thirty-eight".