257471730 has 64 divisors (see below), whose sum is σ = 696049920. Its totient is φ = 67713408.

The previous prime is 257471719. The next prime is 257471737. The reversal of 257471730 is 37174752.

It is not an unprimeable number, because it can be changed into a prime (257471737) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13179 + ... + 26241.

It is an arithmetic number, because the mean of its divisors is an integer number (10875780).

Almost surely, 2^257471730 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 257471730, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (348024960).

257471730 is an abundant number, since it is smaller than the sum of its proper divisors (438578190).

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

257471730 is a wasteful number, since it uses less digits than its factorization.

257471730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13152 (or 13146 counting only the distinct ones).

The product of its (nonzero) digits is 41160, while the sum is 36.

The square root of 257471730 is about 16045.9256510804. The cubic root of 257471730 is about 636.1748807090.

The spelling of 257471730 in words is "two hundred fifty-seven million, four hundred seventy-one thousand, seven hundred thirty".