257347906 has 4 divisors (see below), whose sum is σ = 386021862. Its totient is φ = 128673952.

The previous prime is 257347879. The next prime is 257347907. The reversal of 257347906 is 609743752.

257347906 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 257313681 + 34225 = 16041^2 + 185^2 .

It is not an unprimeable number, because it can be changed into a prime (257347907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64336975 + ... + 64336978.

Almost surely, 2^257347906 is an apocalyptic number.

257347906 is a deficient number, since it is larger than the sum of its proper divisors (128673956).

257347906 is a wasteful number, since it uses less digits than its factorization.

257347906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128673955.

The product of its (nonzero) digits is 317520, while the sum is 43.

The square root of 257347906 is about 16042.0667621102. The cubic root of 257347906 is about 636.0728807084.

The spelling of 257347906 in words is "two hundred fifty-seven million, three hundred forty-seven thousand, nine hundred six".