78327689787 has 24 divisors (see below), whose sum is σ = 113944881648. Its totient is φ = 51848294400.

The previous prime is 78327689779. The next prime is 78327689821. The reversal of 78327689787 is 78798672387.

It is not a de Polignac number, because 78327689787 - 2³ = 78327689779 is a prime.

It is a super-2 number, since 2×78327689787² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78327689747) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 660987 + ... + 770427.

It is an arithmetic number, because the mean of its divisors is an integer number (4747703402).

Almost surely, 2^78327689787 is an apocalyptic number.

78327689787 is a deficient number, since it is larger than the sum of its proper divisors (35617191861).

78327689787 is a wasteful number, since it uses less digits than its factorization.

78327689787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110011 (or 110008 counting only the distinct ones).

The product of its digits is 398297088, while the sum is 72.

The spelling of 78327689787 in words is "seventy-eight billion, three hundred twenty-seven million, six hundred eighty-nine thousand, seven hundred eighty-seven".