557649 has 6 divisors (see below), whose sum is σ = 805506. Its totient is φ = 371760.

The previous prime is 557639. The next prime is 557663. The reversal of 557649 is 946755.

557649 is a `hidden beast` number, since 5 + 5 + 7 + 649 = 666.

It can be written as a sum of positive squares in only one way, i.e., 540225 + 17424 = 735^2 + 132^2 .

It is not a de Polignac number, because 557649 - 2⁴ = 557633 is a prime.

It is a Curzon number.

557649 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (557639) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 30972 + ... + 30989.

It is an arithmetic number, because the mean of its divisors is an integer number (134251).

2⁵⁵⁷⁶⁴⁹ is an apocalyptic number.

It is an amenable number.

557649 is a deficient number, since it is larger than the sum of its proper divisors (247857).

557649 is a wasteful number, since it uses less digits than its factorization.

557649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61967 (or 61964 counting only the distinct ones).

The product of its digits is 37800, while the sum is 36.

The square root of 557649 is about 746.7589972675. The cubic root of 557649 is about 82.3101972761.

It can be divided in two parts, 5576 and 49, that added together give a square (5625 = 75²).

The spelling of 557649 in words is "five hundred fifty-seven thousand, six hundred forty-nine".