257485818 has 8 divisors (see below), whose sum is σ = 514971648. Its totient is φ = 85828604.

The previous prime is 257485817. The next prime is 257485841. The reversal of 257485818 is 818584752.

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

257485818 is an admirable number.

It is a super-2 number, since 2×257485818² = 132597892942258248, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (257485817) 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 3 ways as a sum of consecutive naturals, for example, 21457146 + ... + 21457157.

It is an arithmetic number, because the mean of its divisors is an integer number (64371456).

Almost surely, 2^257485818 is an apocalyptic number.

257485818 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

257485818 is a wasteful number, since it uses less digits than its factorization.

257485818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42914308.

The product of its digits is 716800, while the sum is 48.

The square root of 257485818 is about 16046.3646350194. The cubic root of 257485818 is about 636.1864836246.

The spelling of 257485818 in words is "two hundred fifty-seven million, four hundred eighty-five thousand, eight hundred eighteen".