778834490256 has 135 divisors (see below), whose sum is σ = 2195867681137. Its totient is φ = 257694672000.

The previous prime is 778834490233. The next prime is 778834490261. The reversal of 778834490256 is 652094438877.

The square root of 778834490256 is 882516.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 736884896400 + 41949593856 = 858420^2 + 204816^2 .

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 778834490193 and 778834490202.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 2658138046 + ... + 2658138338.

Almost surely, 2^778834490256 is an apocalyptic number.

778834490256 is the 882516-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 778834490256

778834490256 is an abundant number, since it is smaller than the sum of its proper divisors (1417033190881).

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

778834490256 is an equidigital number, since it uses as much as digits as its factorization.

778834490256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1102 (or 549 counting only the distinct ones).

The product of its (nonzero) digits is 81285120, while the sum is 63.

The spelling of 778834490256 in words is "seven hundred seventy-eight billion, eight hundred thirty-four million, four hundred ninety thousand, two hundred fifty-six".