256764319 has 8 divisors (see below), whose sum is σ = 294506528. Its totient is φ = 219287520.

The previous prime is 256764317. The next prime is 256764353. The reversal of 256764319 is 913467652.

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

It is a cyclic number.

It is not a de Polignac number, because 256764319 - 2¹ = 256764317 is a prime.

It is a super-2 number, since 2×256764319² = 131855831023067522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256764317) 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 7 ways as a sum of consecutive naturals, for example, 64272 + ... + 68149.

It is an arithmetic number, because the mean of its divisors is an integer number (36813316).

Almost surely, 2^256764319 is an apocalyptic number.

256764319 is a deficient number, since it is larger than the sum of its proper divisors (37742209).

256764319 is a wasteful number, since it uses less digits than its factorization.

256764319 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132705.

The product of its digits is 272160, while the sum is 43.

The square root of 256764319 is about 16023.8671674474. The cubic root of 256764319 is about 635.5917100153.

The spelling of 256764319 in words is "two hundred fifty-six million, seven hundred sixty-four thousand, three hundred nineteen".