1256764317 has 8 divisors (see below), whose sum is σ = 1676265024. Its totient is φ = 837553248.

The previous prime is 1256764309. The next prime is 1256764331. The reversal of 1256764317 is 7134676521.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1256764317 - 2³ = 1256764309 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1256764307) 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, 62073 + ... + 79790.

It is an arithmetic number, because the mean of its divisors is an integer number (209533128).

Almost surely, 2^1256764317 is an apocalyptic number.

It is an amenable number.

1256764317 is a deficient number, since it is larger than the sum of its proper divisors (419500707).

1256764317 is a wasteful number, since it uses less digits than its factorization.

1256764317 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144819.

The product of its digits is 211680, while the sum is 42.

The square root of 1256764317 is about 35450.8718792641. The cubic root of 1256764317 is about 1079.1569544031.

The spelling of 1256764317 in words is "one billion, two hundred fifty-six million, seven hundred sixty-four thousand, three hundred seventeen".