7938542647 has 8 divisors (see below), whose sum is σ = 9107924256. Its totient is φ = 6777987072.

The previous prime is 7938542639. The next prime is 7938542671. The reversal of 7938542647 is 7462458397.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 7938542647 - 2³ = 7938542639 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7938542617) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2204578 + ... + 2208175.

It is an arithmetic number, because the mean of its divisors is an integer number (1138490532).

Almost surely, 2^7938542647 is an apocalyptic number.

7938542647 is a deficient number, since it is larger than the sum of its proper divisors (1169381609).

7938542647 is a wasteful number, since it uses less digits than its factorization.

7938542647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4413017.

The product of its digits is 10160640, while the sum is 55.

The square root of 7938542647 is about 89098.4996899499. The cubic root of 7938542647 is about 1994.8653830519.

The spelling of 7938542647 in words is "seven billion, nine hundred thirty-eight million, five hundred forty-two thousand, six hundred forty-seven".