257748842 has 16 divisors (see below), whose sum is σ = 419164200. Its totient is φ = 118160832.

The previous prime is 257748823. The next prime is 257748847. The reversal of 257748842 is 248847752.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 198781801 + 58967041 = 14099^2 + 7679^2 .

It is not an unprimeable number, because it can be changed into a prime (257748847) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29393 + ... + 37140.

Almost surely, 2^257748842 is an apocalyptic number.

257748842 is a deficient number, since it is larger than the sum of its proper divisors (161415358).

257748842 is a wasteful number, since it uses less digits than its factorization.

257748842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66697.

The product of its digits is 1003520, while the sum is 47.

The square root of 257748842 is about 16054.5582935190. The cubic root of 257748842 is about 636.4030332455.

The spelling of 257748842 in words is "two hundred fifty-seven million, seven hundred forty-eight thousand, eight hundred forty-two".