78938726128 has 40 divisors (see below), whose sum is σ = 155036492208. Its totient is φ = 38932480512.

The previous prime is 78938726117. The next prime is 78938726183. The reversal of 78938726128 is 82162783987.

It is a super-2 number, since 2×78938726128² (a number of 23 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (61) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 299950 + ... + 497842.

Almost surely, 2^78938726128 is an apocalyptic number.

It is an amenable number.

78938726128 is a deficient number, since it is larger than the sum of its proper divisors (76097766080).

78938726128 is a wasteful number, since it uses less digits than its factorization.

78938726128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198241 (or 198235 counting only the distinct ones).

The product of its digits is 16257024, while the sum is 61.

The spelling of 78938726128 in words is "seventy-eight billion, nine hundred thirty-eight million, seven hundred twenty-six thousand, one hundred twenty-eight".