257040730 has 8 divisors (see below), whose sum is σ = 462673332. Its totient is φ = 102816288.

The previous prime is 257040701. The next prime is 257040781. The reversal of 257040730 is 37040752.

It can be written as a sum of positive squares in 2 ways, for example, as 236329129 + 20711601 = 15373^2 + 4551^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12852027 + ... + 12852046.

Almost surely, 2^257040730 is an apocalyptic number.

257040730 is a deficient number, since it is larger than the sum of its proper divisors (205632602).

257040730 is a wasteful number, since it uses less digits than its factorization.

257040730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25704080.

The product of its (nonzero) digits is 5880, while the sum is 28.

The square root of 257040730 is about 16032.4898253515. The cubic root of 257040730 is about 635.8197031883.

The spelling of 257040730 in words is "two hundred fifty-seven million, forty thousand, seven hundred thirty".