257405606 has 8 divisors (see below), whose sum is σ = 386190480. Its totient is φ = 128675448.

The previous prime is 257405591. The next prime is 257405651. The reversal of 257405606 is 606504752.

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

It is a congruent number.

It is an unprimeable number.

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, 1415 + ... + 22733.

It is an arithmetic number, because the mean of its divisors is an integer number (48273810).

Almost surely, 2^257405606 is an apocalyptic number.

257405606 is a deficient number, since it is larger than the sum of its proper divisors (128784874).

257405606 is a wasteful number, since it uses less digits than its factorization.

257405606 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27358.

The product of its (nonzero) digits is 50400, while the sum is 35.

The square root of 257405606 is about 16043.8650580214. The cubic root of 257405606 is about 636.1204151443.

The spelling of 257405606 in words is "two hundred fifty-seven million, four hundred five thousand, six hundred six".