557644 has 12 divisors (see below), whose sum is σ = 985600. Its totient is φ = 276048.

The previous prime is 557639. The next prime is 557663. The reversal of 557644 is 446755.

It is a happy number.

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

557644 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 204 + ... + 1075.

2⁵⁵⁷⁶⁴⁴ is an apocalyptic number.

It is an amenable number.

557644 is a deficient number, since it is larger than the sum of its proper divisors (427956).

557644 is a wasteful number, since it uses less digits than its factorization.

557644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1392 (or 1390 counting only the distinct ones).

The product of its digits is 16800, while the sum is 31.

The square root of 557644 is about 746.7556494597. The cubic root of 557644 is about 82.3099512718.

Subtracting from 557644 its reverse (446755), we obtain a square (110889 = 333²).

The spelling of 557644 in words is "five hundred fifty-seven thousand, six hundred forty-four".