778138074020 has 24 divisors (see below), whose sum is σ = 1690437886200. Its totient is φ = 300522290432.

The previous prime is 778138074019. The next prime is 778138074029. The reversal of 778138074020 is 20470831877.

778138074020 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 18632796004 + 759505278016 = 136502^2 + 871496^2 .

It is not an unprimeable number, because it can be changed into a prime (778138074029) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 670808105 + ... + 670809264.

It is an arithmetic number, because the mean of its divisors is an integer number (70434911925).

Almost surely, 2^778138074020 is an apocalyptic number.

It is an amenable number.

778138074020 is an abundant number, since it is smaller than the sum of its proper divisors (912299812180).

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

778138074020 is a wasteful number, since it uses less digits than its factorization.

778138074020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1341617407 (or 1341617405 counting only the distinct ones).

The product of its (nonzero) digits is 526848, while the sum is 47.

The spelling of 778138074020 in words is "seven hundred seventy-eight billion, one hundred thirty-eight million, seventy-four thousand, twenty".