78688418128 has 40 divisors (see below), whose sum is σ = 154595183400. Its totient is φ = 38793222144.

The previous prime is 78688418101. The next prime is 78688418131. The reversal of 78688418128 is 82181488687.

It can be written as a sum of positive squares in 4 ways, for example, as 987970624 + 77700447504 = 31432^2 + 278748^2 .

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, 4650708 + ... + 4667596.

It is an arithmetic number, because the mean of its divisors is an integer number (3864879585).

Almost surely, 2^78688418128 is an apocalyptic number.

It is an amenable number.

78688418128 is a deficient number, since it is larger than the sum of its proper divisors (75906765272).

78688418128 is a wasteful number, since it uses less digits than its factorization.

78688418128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20959 (or 20953 counting only the distinct ones).

The product of its digits is 11010048, while the sum is 61.

The spelling of 78688418128 in words is "seventy-eight billion, six hundred eighty-eight million, four hundred eighteen thousand, one hundred twenty-eight".