78726787656 has 32 divisors (see below), whose sum is σ = 214709421600. Its totient is φ = 23856602240.

The previous prime is 78726787651. The next prime is 78726787669. The reversal of 78726787656 is 65678762787.

It is not an unprimeable number, because it can be changed into a prime (78726787651) 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, 149103501 + ... + 149104028.

It is an arithmetic number, because the mean of its divisors is an integer number (6709669425).

Almost surely, 2^78726787656 is an apocalyptic number.

It is an amenable number.

78726787656 is an abundant number, since it is smaller than the sum of its proper divisors (135982633944).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78726787656 is a wasteful number, since it uses less digits than its factorization.

78726787656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 298207549 (or 298207545 counting only the distinct ones).

The product of its digits is 331914240, while the sum is 69.

The spelling of 78726787656 in words is "seventy-eight billion, seven hundred twenty-six million, seven hundred eighty-seven thousand, six hundred fifty-six".