774825978564 has 81 divisors (see below), whose sum is σ = 2152989441421. Its totient is φ = 234778146240.

The previous prime is 774825978547. The next prime is 774825978569. The reversal of 774825978564 is 465879528477.

It is a happy number.

The square root of 774825978564 is 880242.

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

774825978564 is a `hidden beast` number, since 7 + 7 + 4 + 8 + 2 + 59 + 7 + 8 + 564 = 666.

It can be written as a sum of positive squares in only one way, i.e., 217426364100 + 557399614464 = 466290^2 + 746592^2 .

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 774825978492 and 774825978501.

It is not an unprimeable number, because it can be changed into a prime (774825978569) by changing a digit.

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, 58089304 + ... + 58102640.

Almost surely, 2^774825978564 is an apocalyptic number.

774825978564 is the 880242-nd square number.

It is an amenable number.

774825978564 is an abundant number, since it is smaller than the sum of its proper divisors (1378163462857).

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

774825978564 is a wasteful number, since it uses less digits than its factorization.

774825978564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26706 (or 13353 counting only the distinct ones).

The product of its digits is 948326400, while the sum is 72.

The spelling of 774825978564 in words is "seven hundred seventy-four billion, eight hundred twenty-five million, nine hundred seventy-eight thousand, five hundred sixty-four".