555640 has 32 divisors (see below), whose sum is σ = 1296000. Its totient is φ = 214144.

The previous prime is 555637. The next prime is 555661. The reversal of 555640 is 46555.

555640 is nontrivially palindromic in base 16.

555640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 921 + ... + 1399.

It is an arithmetic number, because the mean of its divisors is an integer number (40500).

2⁵⁵⁵⁶⁴⁰ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 555640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (648000).

555640 is an abundant number, since it is smaller than the sum of its proper divisors (740360).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

555640 is a wasteful number, since it uses less digits than its factorization.

555640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 519 (or 515 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 25.

The square root of 555640 is about 745.4126374029. The cubic root of 555640 is about 82.2112340915.

The spelling of 555640 in words is "five hundred fifty-five thousand, six hundred forty".