78071717078 has 32 divisors (see below), whose sum is σ = 120021350400. Its totient is φ = 38076083136.

The previous prime is 78071717077. The next prime is 78071717081. The reversal of 78071717078 is 87071717087.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78071717077) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8231543 + ... + 8241021.

It is an arithmetic number, because the mean of its divisors is an integer number (3750667200).

Almost surely, 2^78071717078 is an apocalyptic number.

78071717078 is a deficient number, since it is larger than the sum of its proper divisors (41949633322).

78071717078 is a wasteful number, since it uses less digits than its factorization.

78071717078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10076.

The product of its (nonzero) digits is 1075648, while the sum is 53.

Subtracting 78071717078 from its reverse (87071717087), we obtain a palindrome (9000000009).

The spelling of 78071717078 in words is "seventy-eight billion, seventy-one million, seven hundred seventeen thousand, seventy-eight".