257444725 has 6 divisors (see below), whose sum is σ = 319231490. Its totient is φ = 205955760.

The previous prime is 257444723. The next prime is 257444731. The reversal of 257444725 is 527444752.

It can be written as a sum of positive squares in 3 ways, for example, as 131044 + 257313681 = 362^2 + 16041^2 .

It is not a de Polignac number, because 257444725 - 2¹ = 257444723 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257444723) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5148870 + ... + 5148919.

Almost surely, 2^257444725 is an apocalyptic number.

257444725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

257444725 is a deficient number, since it is larger than the sum of its proper divisors (61786765).

257444725 is a wasteful number, since it uses less digits than its factorization.

257444725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10297799 (or 10297794 counting only the distinct ones).

The product of its digits is 313600, while the sum is 40.

The square root of 257444725 is about 16045.0841381403. The cubic root of 257444725 is about 636.1526381333.

The spelling of 257444725 in words is "two hundred fifty-seven million, four hundred forty-four thousand, seven hundred twenty-five".