78881639422398 has 64 divisors (see below), whose sum is σ = 165122847751680. Its totient is φ = 25074244242432.

The previous prime is 78881639422303. The next prime is 78881639422433. The reversal of 78881639422398 is 89322493618887.

78881639422398 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 750507786 + ... + 750612882.

It is an arithmetic number, because the mean of its divisors is an integer number (2580044496120).

Almost surely, 2^{78881639422398} is an apocalyptic number.

78881639422398 is an abundant number, since it is smaller than the sum of its proper divisors (86241208329282).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78881639422398 is a wasteful number, since it uses less digits than its factorization.

78881639422398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121601.

The product of its digits is 2006581248, while the sum is 78.

The spelling of 78881639422398 in words is "seventy-eight trillion, eight hundred eighty-one billion, six hundred thirty-nine million, four hundred twenty-two thousand, three hundred ninety-eight".