257297644 has 12 divisors (see below), whose sum is σ = 464795968. Its totient is φ = 124498800.

The previous prime is 257297633. The next prime is 257297653. The reversal of 257297644 is 446792752.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 257297594 and 257297603.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1037367 + ... + 1037614.

Almost surely, 2^257297644 is an apocalyptic number.

It is an amenable number.

257297644 is a deficient number, since it is larger than the sum of its proper divisors (207498324).

257297644 is a wasteful number, since it uses less digits than its factorization.

257297644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2075016 (or 2075014 counting only the distinct ones).

The product of its digits is 846720, while the sum is 46.

The square root of 257297644 is about 16040.5001168916. The cubic root of 257297644 is about 636.0314680579.

The spelling of 257297644 in words is "two hundred fifty-seven million, two hundred ninety-seven thousand, six hundred forty-four".