557685 has 36 divisors (see below), whose sum is σ = 1062828. Its totient is φ = 279936.

The previous prime is 557671. The next prime is 557693. The reversal of 557685 is 586755.

557685 is a `hidden beast` number, since 5 + 576 + 85 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 321489 + 236196 = 567^2 + 486^2 .

It is not a de Polignac number, because 557685 - 2¹¹ = 555637 is a prime.

It is a super-2 number, since 2×557685² = 622025118450, which contains 22 as substring.

It is an Ulam number.

Its product of digits (42000) is a multiple of the sum of its prime divisors (25).

557685 is a lucky number.

It is a plaindrome in base 13.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 32797 + ... + 32813.

It is an arithmetic number, because the mean of its divisors is an integer number (29523).

2⁵⁵⁷⁶⁸⁵ is an apocalyptic number.

It is an amenable number.

557685 is a deficient number, since it is larger than the sum of its proper divisors (505143).

557685 is an frugal number, since it uses more digits than its factorization.

557685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46 (or 25 counting only the distinct ones).

The product of its digits is 42000, while the sum is 36.

The square root of 557685 is about 746.7831010407. The cubic root of 557685 is about 82.3119684639.

The spelling of 557685 in words is "five hundred fifty-seven thousand, six hundred eighty-five".