656623 has 4 divisors (see below), whose sum is σ = 716328. Its totient is φ = 596920.

The previous prime is 656609. The next prime is 656651. The reversal of 656623 is 326656.

656623 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-656623 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 656591 and 656600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (656603) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29836 + ... + 29857.

It is an arithmetic number, because the mean of its divisors is an integer number (179082).

2⁶⁵⁶⁶²³ is an apocalyptic number.

656623 is a deficient number, since it is larger than the sum of its proper divisors (59705).

656623 is a wasteful number, since it uses less digits than its factorization.

656623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59704.

The product of its digits is 6480, while the sum is 28.

The square root of 656623 is about 810.3227751952. The cubic root of 656623 is about 86.9171272316.

The spelling of 656623 in words is "six hundred fifty-six thousand, six hundred twenty-three".