778784064 has 56 divisors (see below), whose sum is σ = 2067275520. Its totient is φ = 258745344.

The previous prime is 778784063. The next prime is 778784099. The reversal of 778784064 is 460487877.

It is a junction number, because it is equal to n+sod(n) for n = 778783998 and 778784016.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (778784063) 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, 53617 + ... + 66575.

Almost surely, 2^778784064 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 778784064, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1033637760).

778784064 is an abundant number, since it is smaller than the sum of its proper divisors (1288491456).

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

778784064 is a wasteful number, since it uses less digits than its factorization.

778784064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13287 (or 13277 counting only the distinct ones).

The product of its (nonzero) digits is 2107392, while the sum is 51.

The square root of 778784064 is about 27906.7028507490. The cubic root of 778784064 is about 920.0378308325.

The spelling of 778784064 in words is "seven hundred seventy-eight million, seven hundred eighty-four thousand, sixty-four".