778017781828 has 24 divisors (see below), whose sum is σ = 1561820097600. Its totient is φ = 332196649248.

The previous prime is 778017781823. The next prime is 778017781837. The reversal of 778017781828 is 828187710877.

It is a super-2 number, since 2×778017781828² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 778017781828.

It is not an unprimeable number, because it can be changed into a prime (778017781823) 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, 51639958 + ... + 51655021.

It is an arithmetic number, because the mean of its divisors is an integer number (65075837400).

Almost surely, 2^778017781828 is an apocalyptic number.

It is an amenable number.

778017781828 is an abundant number, since it is smaller than the sum of its proper divisors (783802315772).

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

778017781828 is a wasteful number, since it uses less digits than its factorization.

778017781828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103295259 (or 103295257 counting only the distinct ones).

The product of its (nonzero) digits is 19668992, while the sum is 64.

The spelling of 778017781828 in words is "seven hundred seventy-eight billion, seventeen million, seven hundred eighty-one thousand, eight hundred twenty-eight".