257686852 has 6 divisors (see below), whose sum is σ = 450951998. Its totient is φ = 128843424.

The previous prime is 257686843. The next prime is 257686859. The reversal of 257686852 is 258686752.

It can be written as a sum of positive squares in only one way, i.e., 142468096 + 115218756 = 11936^2 + 10734^2 .

It is a super-3 number, since 3×257686852³ (a number of 26 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 257686796 and 257686805.

It is not an unprimeable number, because it can be changed into a prime (257686859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32210853 + ... + 32210860.

Almost surely, 2^257686852 is an apocalyptic number.

It is an amenable number.

257686852 is a deficient number, since it is larger than the sum of its proper divisors (193265146).

257686852 is a wasteful number, since it uses less digits than its factorization.

257686852 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64421717 (or 64421715 counting only the distinct ones).

The product of its digits is 1612800, while the sum is 49.

The square root of 257686852 is about 16052.6275730797. The cubic root of 257686852 is about 636.3520096899.

The spelling of 257686852 in words is "two hundred fifty-seven million, six hundred eighty-six thousand, eight hundred fifty-two".