257442647 has 32 divisors (see below), whose sum is σ = 340416000. Its totient is φ = 188611200.

The previous prime is 257442643. The next prime is 257442667. The reversal of 257442647 is 746244752.

It is a cyclic number.

It is not a de Polignac number, because 257442647 - 2² = 257442643 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257442643) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 217397 + ... + 218577.

It is an arithmetic number, because the mean of its divisors is an integer number (10638000).

Almost surely, 2^257442647 is an apocalyptic number.

257442647 is a deficient number, since it is larger than the sum of its proper divisors (82973353).

257442647 is a wasteful number, since it uses less digits than its factorization.

257442647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1367.

The product of its digits is 376320, while the sum is 41.

The square root of 257442647 is about 16045.0193829736. The cubic root of 257442647 is about 636.1509265313.

The spelling of 257442647 in words is "two hundred fifty-seven million, four hundred forty-two thousand, six hundred forty-seven".