78216637826 has 16 divisors (see below), whose sum is σ = 118809277440. Its totient is φ = 38616464880.

The previous prime is 78216637823. The next prime is 78216637843. The reversal of 78216637826 is 62873661287.

It is a super-2 number, since 2×78216637826² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78216637823) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 676121 + ... + 783308.

It is an arithmetic number, because the mean of its divisors is an integer number (7425579840).

Almost surely, 2^78216637826 is an apocalyptic number.

78216637826 is a deficient number, since it is larger than the sum of its proper divisors (40592639614).

78216637826 is a wasteful number, since it uses less digits than its factorization.

78216637826 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1459769.

The product of its digits is 8128512, while the sum is 56.

The spelling of 78216637826 in words is "seventy-eight billion, two hundred sixteen million, six hundred thirty-seven thousand, eight hundred twenty-six".