257057447 has 4 divisors (see below), whose sum is σ = 257173896. Its totient is φ = 256941000.

The previous prime is 257057431. The next prime is 257057509. The reversal of 257057447 is 744750752.

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

It is a cyclic number.

It is not a de Polignac number, because 257057447 - 2⁴ = 257057431 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 (257017447) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54848 + ... + 59349.

It is an arithmetic number, because the mean of its divisors is an integer number (64293474).

Almost surely, 2^257057447 is an apocalyptic number.

257057447 is a deficient number, since it is larger than the sum of its proper divisors (116449).

257057447 is a wasteful number, since it uses less digits than its factorization.

257057447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116448.

The product of its (nonzero) digits is 274400, while the sum is 41.

The square root of 257057447 is about 16033.0111644694. The cubic root of 257057447 is about 635.8334866946.

The spelling of 257057447 in words is "two hundred fifty-seven million, fifty-seven thousand, four hundred forty-seven".