257091290 has 8 divisors (see below), whose sum is σ = 462764340. Its totient is φ = 102836512.

The previous prime is 257091283. The next prime is 257091313. The reversal of 257091290 is 92190752.

It can be written as a sum of positive squares in 2 ways, for example, as 238177489 + 18913801 = 15433^2 + 4349^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 257091290.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12854555 + ... + 12854574.

Almost surely, 2^257091290 is an apocalyptic number.

257091290 is a deficient number, since it is larger than the sum of its proper divisors (205673050).

257091290 is a wasteful number, since it uses less digits than its factorization.

257091290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25709136.

The product of its (nonzero) digits is 11340, while the sum is 35.

The square root of 257091290 is about 16034.0665459515. The cubic root of 257091290 is about 635.8613891067.

The spelling of 257091290 in words is "two hundred fifty-seven million, ninety-one thousand, two hundred ninety".