1256763256 has 32 divisors (see below), whose sum is σ = 2785932000. Its totient is φ = 520039296.

The previous prime is 1256763251. The next prime is 1256763259. The reversal of 1256763256 is 6523676521.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1256763251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 385311 + ... + 388558.

It is an arithmetic number, because the mean of its divisors is an integer number (87060375).

Almost surely, 2^1256763256 is an apocalyptic number.

It is an amenable number.

1256763256 is an abundant number, since it is smaller than the sum of its proper divisors (1529168744).

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

1256763256 is a wasteful number, since it uses less digits than its factorization.

1256763256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 773911 (or 773907 counting only the distinct ones).

The product of its digits is 453600, while the sum is 43.

The square root of 1256763256 is about 35450.8569148899. The cubic root of 1256763256 is about 1079.1566507169.

The spelling of 1256763256 in words is "one billion, two hundred fifty-six million, seven hundred sixty-three thousand, two hundred fifty-six".