257643434 has 8 divisors (see below), whose sum is σ = 388082880. Its totient is φ = 128282476.

The previous prime is 257643431. The next prime is 257643457. The reversal of 257643434 is 434346752.

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

It is not an unprimeable number, because it can be changed into a prime (257643431) 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 3 ways as a sum of consecutive naturals, for example, 269024 + ... + 269979.

It is an arithmetic number, because the mean of its divisors is an integer number (48510360).

Almost surely, 2^257643434 is an apocalyptic number.

257643434 is a deficient number, since it is larger than the sum of its proper divisors (130439446).

257643434 is a wasteful number, since it uses less digits than its factorization.

257643434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 539244.

The product of its digits is 241920, while the sum is 38.

The square root of 257643434 is about 16051.2751518376. The cubic root of 257643434 is about 636.3162677506.

The spelling of 257643434 in words is "two hundred fifty-seven million, six hundred forty-three thousand, four hundred thirty-four".