781638327347 has 4 divisors (see below), whose sum is σ = 781734822096. Its totient is φ = 781541832600.

The previous prime is 781638327313. The next prime is 781638327367. The reversal of 781638327347 is 743723836187.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 743723836187 = 10243 ⋅72608009.

It is a cyclic number.

It is not a de Polignac number, because 781638327347 - 2¹⁴ = 781638310963 is a prime.

It is a super-2 number, since 2×781638327347² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (781638327367) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 48235223 + ... + 48251424.

It is an arithmetic number, because the mean of its divisors is an integer number (195433705524).

Almost surely, 2^781638327347 is an apocalyptic number.

781638327347 is a deficient number, since it is larger than the sum of its proper divisors (96494749).

781638327347 is an equidigital number, since it uses as much as digits as its factorization.

781638327347 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96494748.

The product of its digits is 28449792, while the sum is 59.

The spelling of 781638327347 in words is "seven hundred eighty-one billion, six hundred thirty-eight million, three hundred twenty-seven thousand, three hundred forty-seven".