656538 has 8 divisors (see below), whose sum is σ = 1313088. Its totient is φ = 218844.

The previous prime is 656527. The next prime is 656561. The reversal of 656538 is 835656.

It is a sphenic number, since it is the product of 3 distinct primes.

656538 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 656499 and 656508.

It is an unprimeable number.

656538 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54706 + ... + 54717.

It is an arithmetic number, because the mean of its divisors is an integer number (164136).

2⁶⁵⁶⁵³⁸ is an apocalyptic number.

656538 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

656538 is a wasteful number, since it uses less digits than its factorization.

656538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109428.

The product of its digits is 21600, while the sum is 33.

The square root of 656538 is about 810.2703252619. The cubic root of 656538 is about 86.9133765890.

The spelling of 656538 in words is "six hundred fifty-six thousand, five hundred thirty-eight".