78343790064 has 20 divisors (see below), whose sum is σ = 202388124456. Its totient is φ = 26114596672.

The previous prime is 78343790051. The next prime is 78343790111. The reversal of 78343790064 is 46009734387.

It is a happy number.

It is a super-2 number, since 2×78343790064² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78343789989 and 78343790016.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 816081099 + ... + 816081194.

Almost surely, 2^78343790064 is an apocalyptic number.

It is an amenable number.

78343790064 is an abundant number, since it is smaller than the sum of its proper divisors (124044334392).

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

78343790064 is a wasteful number, since it uses less digits than its factorization.

78343790064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1632162304 (or 1632162298 counting only the distinct ones).

The product of its (nonzero) digits is 3048192, while the sum is 51.

The spelling of 78343790064 in words is "seventy-eight billion, three hundred forty-three million, seven hundred ninety thousand, sixty-four".