774666656 has 48 divisors (see below), whose sum is σ = 1575438984. Its totient is φ = 374759424.

The previous prime is 774666649. The next prime is 774666671. The reversal of 774666656 is 656666477.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 767290000 + 7376656 = 27700^2 + 2716^2 .

It is a Harshad number since it is a multiple of its sum of digits (53).

It is a junction number, because it is equal to n+sod(n) for n = 774666598 and 774666607.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 120680 + ... + 126936.

Almost surely, 2^774666656 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 774666656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (787719492).

774666656 is an abundant number, since it is smaller than the sum of its proper divisors (800772328).

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

774666656 is a wasteful number, since it uses less digits than its factorization.

774666656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6393 (or 6385 counting only the distinct ones).

The product of its digits is 7620480, while the sum is 53.

The square root of 774666656 is about 27832.8341352439. The cubic root of 774666656 is about 918.4135608280.

The spelling of 774666656 in words is "seven hundred seventy-four million, six hundred sixty-six thousand, six hundred fifty-six".