256386573 has 8 divisors (see below), whose sum is σ = 379832000. Its totient is φ = 170924364.

The previous prime is 256386569. The next prime is 256386587. The reversal of 256386573 is 375683652.

256386573 is a `hidden beast` number, since 2 + 5 + 638 + 6 + 5 + 7 + 3 = 666.

It is not a de Polignac number, because 256386573 - 2² = 256386569 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 (256384573) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4747873 + ... + 4747926.

It is an arithmetic number, because the mean of its divisors is an integer number (47479000).

Almost surely, 2^256386573 is an apocalyptic number.

It is an amenable number.

256386573 is a deficient number, since it is larger than the sum of its proper divisors (123445427).

256386573 is an equidigital number, since it uses as much as digits as its factorization.

256386573 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9495808 (or 9495802 counting only the distinct ones).

The product of its digits is 907200, while the sum is 45.

The square root of 256386573 is about 16012.0758491833. The cubic root of 256386573 is about 635.2798675407.

The spelling of 256386573 in words is "two hundred fifty-six million, three hundred eighty-six thousand, five hundred seventy-three".