257716644 has 24 divisors (see below), whose sum is σ = 608952960. Its totient is φ = 84817824.

The previous prime is 257716631. The next prime is 257716663. The reversal of 257716644 is 446617752.

It is a junction number, because it is equal to n+sod(n) for n = 257716596 and 257716605.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 134979 + ... + 136874.

It is an arithmetic number, because the mean of its divisors is an integer number (25373040).

Almost surely, 2^257716644 is an apocalyptic number.

It is an amenable number.

257716644 is an abundant number, since it is smaller than the sum of its proper divisors (351236316).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

257716644 is a wasteful number, since it uses less digits than its factorization.

257716644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 271939 (or 271937 counting only the distinct ones).

The product of its digits is 282240, while the sum is 42.

The square root of 257716644 is about 16053.5554940331. Note that the first 3 decimals coincide. The cubic root of 257716644 is about 636.3765323076.

The spelling of 257716644 in words is "two hundred fifty-seven million, seven hundred sixteen thousand, six hundred forty-four".