257445740 has 12 divisors (see below), whose sum is σ = 540636096. Its totient is φ = 102978288.

The previous prime is 257445709. The next prime is 257445767. The reversal of 257445740 is 47544752.

It is a junction number, because it is equal to n+sod(n) for n = 257445694 and 257445703.

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, 6436124 + ... + 6436163.

It is an arithmetic number, because the mean of its divisors is an integer number (45053008).

Almost surely, 2^257445740 is an apocalyptic number.

257445740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

257445740 is an abundant number, since it is smaller than the sum of its proper divisors (283190356).

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

257445740 is a wasteful number, since it uses less digits than its factorization.

257445740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12872296 (or 12872294 counting only the distinct ones).

The product of its (nonzero) digits is 156800, while the sum is 38.

The square root of 257445740 is about 16045.1157677344. The cubic root of 257445740 is about 636.1534741627.

The spelling of 257445740 in words is "two hundred fifty-seven million, four hundred forty-five thousand, seven hundred forty".