257712380 has 24 divisors (see below), whose sum is σ = 541846032. Its totient is φ = 102961152.

The previous prime is 257712379. The next prime is 257712397. The reversal of 257712380 is 83217752.

It is a self number, because there is not a number n which added to its sum of digits gives 257712380.

It is a congruent number.

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, 10364 + ... + 24956.

It is an arithmetic number, because the mean of its divisors is an integer number (22576918).

Almost surely, 2^257712380 is an apocalyptic number.

257712380 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

257712380 is an abundant number, since it is smaller than the sum of its proper divisors (284133652).

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

257712380 is a wasteful number, since it uses less digits than its factorization.

257712380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15485 (or 15483 counting only the distinct ones).

The product of its (nonzero) digits is 23520, while the sum is 35.

The square root of 257712380 is about 16053.4226880127. The cubic root of 257712380 is about 636.3730226074.

The spelling of 257712380 in words is "two hundred fifty-seven million, seven hundred twelve thousand, three hundred eighty".