257925490 has 8 divisors (see below), whose sum is σ = 464265900. Its totient is φ = 103170192.

The previous prime is 257925439. The next prime is 257925509. The reversal of 257925490 is 94529752.

It can be written as a sum of positive squares in 2 ways, for example, as 251888641 + 6036849 = 15871^2 + 2457^2 .

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 (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12896265 + ... + 12896284.

Almost surely, 2^257925490 is an apocalyptic number.

257925490 is a deficient number, since it is larger than the sum of its proper divisors (206340410).

257925490 is a wasteful number, since it uses less digits than its factorization.

257925490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25792556.

The product of its (nonzero) digits is 226800, while the sum is 43.

The square root of 257925490 is about 16060.0588417353. The cubic root of 257925490 is about 636.5483861787.

The spelling of 257925490 in words is "two hundred fifty-seven million, nine hundred twenty-five thousand, four hundred ninety".