78836378138 has 16 divisors (see below), whose sum is σ = 135372963264. Its totient is φ = 33730797600.

The previous prime is 78836378129. The next prime is 78836378183. The reversal of 78836378138 is 83187363887.

It is a Smith number, since the sum of its digits (62) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax 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, 4676420 + ... + 4693247.

It is an arithmetic number, because the mean of its divisors is an integer number (8460810204).

Almost surely, 2^78836378138 is an apocalyptic number.

78836378138 is a deficient number, since it is larger than the sum of its proper divisors (56536585126).

78836378138 is a wasteful number, since it uses less digits than its factorization.

78836378138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9370277.

The product of its digits is 32514048, while the sum is 62.

The spelling of 78836378138 in words is "seventy-eight billion, eight hundred thirty-six million, three hundred seventy-eight thousand, one hundred thirty-eight".