78218637832688 has 20 divisors (see below), whose sum is σ = 151551433707240. Its totient is φ = 39108590424384.

The previous prime is 78218637832681. The next prime is 78218637832757. The reversal of 78218637832688 is 88623873681287.

It is a super-2 number, since 2×78218637832688² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78218637832681) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44644418 + ... + 46363361.

It is an arithmetic number, because the mean of its divisors is an integer number (7577571685362).

Almost surely, 2^{78218637832688} is an apocalyptic number.

It is an amenable number.

78218637832688 is a deficient number, since it is larger than the sum of its proper divisors (73332795874552).

78218637832688 is a wasteful number, since it uses less digits than its factorization.

78218637832688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91061504 (or 91061498 counting only the distinct ones).

The product of its digits is 2080899072, while the sum is 77.

The spelling of 78218637832688 in words is "seventy-eight trillion, two hundred eighteen billion, six hundred thirty-seven million, eight hundred thirty-two thousand, six hundred eighty-eight".