256493287 has 8 divisors (see below), whose sum is σ = 271924352. Its totient is φ = 241509600.

The previous prime is 256493269. The next prime is 256493351. The reversal of 256493287 is 782394652.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-256493287 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256493257) 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, 110664 + ... + 112957.

It is an arithmetic number, because the mean of its divisors is an integer number (33990544).

Almost surely, 2^256493287 is an apocalyptic number.

256493287 is the 9247-th hex number.

256493287 is a deficient number, since it is larger than the sum of its proper divisors (15431065).

256493287 is a wasteful number, since it uses less digits than its factorization.

256493287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223689.

The product of its digits is 725760, while the sum is 46.

The square root of 256493287 is about 16015.4077999906. The cubic root of 256493287 is about 635.3679946886.

The spelling of 256493287 in words is "two hundred fifty-six million, four hundred ninety-three thousand, two hundred eighty-seven".