257445345 has 24 divisors (see below), whose sum is σ = 434742336. Its totient is φ = 130074912.

The previous prime is 257445337. The next prime is 257445347. The reversal of 257445345 is 543544752.

It is not a de Polignac number, because 257445345 - 2³ = 257445337 is a prime.

It is not an unprimeable number, because it can be changed into a prime (257445347) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18357 + ... + 29186.

It is an arithmetic number, because the mean of its divisors is an integer number (18114264).

Almost surely, 2^257445345 is an apocalyptic number.

It is an amenable number.

257445345 is a deficient number, since it is larger than the sum of its proper divisors (177296991).

257445345 is a wasteful number, since it uses less digits than its factorization.

257445345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47589 (or 47570 counting only the distinct ones).

The product of its digits is 336000, while the sum is 39.

The square root of 257445345 is about 16045.1034586879. The cubic root of 257445345 is about 636.1531488116.

The spelling of 257445345 in words is "two hundred fifty-seven million, four hundred forty-five thousand, three hundred forty-five".