78683438687 has 24 divisors (see below), whose sum is σ = 92526414624. Its totient is φ = 66709343232.

The previous prime is 78683438641. The next prime is 78683438719.

78683438687 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 78683438687 - 2⁶ = 78683438623 is a prime.

It is a super-2 number, since 2×78683438687² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78683438987) 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 23 ways as a sum of consecutive naturals, for example, 10914038 + ... + 10921244.

It is an arithmetic number, because the mean of its divisors is an integer number (3855267276).

Almost surely, 2^78683438687 is an apocalyptic number.

78683438687 is a deficient number, since it is larger than the sum of its proper divisors (13842975937).

78683438687 is a wasteful number, since it uses less digits than its factorization.

78683438687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9615 (or 9608 counting only the distinct ones).

The product of its digits is 260112384, while the sum is 68.

The spelling of 78683438687 in words is "seventy-eight billion, six hundred eighty-three million, four hundred thirty-eight thousand, six hundred eighty-seven".