1256771682 has 144 divisors (see below), whose sum is σ = 3149632512. Its totient is φ = 360495360.

The previous prime is 1256771671. The next prime is 1256771683. The reversal of 1256771682 is 2861776521.

1256771682 is a `hidden beast` number, since 1 + 2 + 567 + 7 + 1 + 6 + 82 = 666.

It is not an unprimeable number, because it can be changed into a prime (1256771683) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 3424263 + ... + 3424629.

It is an arithmetic number, because the mean of its divisors is an integer number (21872448).

Almost surely, 2^1256771682 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1256771682, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1574816256).

1256771682 is an abundant number, since it is smaller than the sum of its proper divisors (1892860830).

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

1256771682 is a wasteful number, since it uses less digits than its factorization.

1256771682 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 461 (or 439 counting only the distinct ones).

The product of its digits is 282240, while the sum is 45.

The square root of 1256771682 is about 35450.9757552595. The cubic root of 1256771682 is about 1079.1590624556.

The spelling of 1256771682 in words is "one billion, two hundred fifty-six million, seven hundred seventy-one thousand, six hundred eighty-two".