257645382 has 8 divisors (see below), whose sum is σ = 515290776. Its totient is φ = 85881792.

The previous prime is 257645369. The next prime is 257645383. The reversal of 257645382 is 283546752.

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

257645382 is an admirable number.

It is a super-2 number, since 2×257645382² = 132762285731851848, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257645383) by changing a digit.

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, 21470443 + ... + 21470454.

It is an arithmetic number, because the mean of its divisors is an integer number (64411347).

Almost surely, 2^257645382 is an apocalyptic number.

257645382 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.

257645382 is a wasteful number, since it uses less digits than its factorization.

257645382 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42940902.

The product of its digits is 403200, while the sum is 42.

The square root of 257645382 is about 16051.3358322602. The cubic root of 257645382 is about 636.3178714411.

The spelling of 257645382 in words is "two hundred fifty-seven million, six hundred forty-five thousand, three hundred eighty-two".