257243577 has 8 divisors (see below), whose sum is σ = 343160064. Its totient is φ = 171411408.

The previous prime is 257243563. The next prime is 257243593. The reversal of 257243577 is 775342752.

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 257243577 - 2¹⁰ = 257242553 is a prime.

It is not an unprimeable number, because it can be changed into a prime (257243537) 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, 13578 + ... + 26435.

It is an arithmetic number, because the mean of its divisors is an integer number (42895008).

Almost surely, 2^257243577 is an apocalyptic number.

It is an amenable number.

257243577 is a deficient number, since it is larger than the sum of its proper divisors (85916487).

257243577 is a wasteful number, since it uses less digits than its factorization.

257243577 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42159.

The product of its digits is 411600, while the sum is 42.

The square root of 257243577 is about 16038.8147005943. The cubic root of 257243577 is about 635.9869143109.

The spelling of 257243577 in words is "two hundred fifty-seven million, two hundred forty-three thousand, five hundred seventy-seven".