257044643 has 8 divisors (see below), whose sum is σ = 259600848. Its totient is φ = 254500704.

The previous prime is 257044577. The next prime is 257044679. The reversal of 257044643 is 346440752.

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 257044643 - 2⁸ = 257044387 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (257044693) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42305 + ... + 47997.

It is an arithmetic number, because the mean of its divisors is an integer number (32450106).

Almost surely, 2^257044643 is an apocalyptic number.

257044643 is a deficient number, since it is larger than the sum of its proper divisors (2556205).

257044643 is a wasteful number, since it uses less digits than its factorization.

257044643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6133.

The product of its (nonzero) digits is 80640, while the sum is 35.

The square root of 257044643 is about 16032.6118583342. The cubic root of 257044643 is about 635.8229295900.

The spelling of 257044643 in words is "two hundred fifty-seven million, forty-four thousand, six hundred forty-three".