257717172 has 12 divisors (see below), whose sum is σ = 601340096. Its totient is φ = 85905720.

The previous prime is 257717137. The next prime is 257717177. The reversal of 257717172 is 271717752.

It is a tau number, because it is divible by the number of its divisors (12).

It is a self number, because there is not a number n which added to its sum of digits gives 257717172.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257717177) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10738204 + ... + 10738227.

Almost surely, 2^257717172 is an apocalyptic number.

It is an amenable number.

257717172 is an abundant number, since it is smaller than the sum of its proper divisors (343622924).

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

257717172 is a wasteful number, since it uses less digits than its factorization.

257717172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21476438 (or 21476436 counting only the distinct ones).

The product of its digits is 48020, while the sum is 39.

The square root of 257717172 is about 16053.5719389798. The cubic root of 257717172 is about 636.3769669019.

The spelling of 257717172 in words is "two hundred fifty-seven million, seven hundred seventeen thousand, one hundred seventy-two".