623556 has 18 divisors (see below), whose sum is σ = 1576302. Its totient is φ = 207840.

The previous prime is 623537. The next prime is 623563. The reversal of 623556 is 655326.

It can be written as a sum of positive squares in only one way, i.e., 476100 + 147456 = 690^2 + 384^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a plaindrome in base 14.

It is an unprimeable number.

623556 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 5 ways as a sum of consecutive naturals, for example, 8625 + ... + 8696.

2⁶²³⁵⁵⁶ is an apocalyptic number.

It is an amenable number.

623556 is an abundant number, since it is smaller than the sum of its proper divisors (952746).

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

623556 is a wasteful number, since it uses less digits than its factorization.

623556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17331 (or 17326 counting only the distinct ones).

The product of its digits is 5400, while the sum is 27.

The square root of 623556 is about 789.6556211413. The cubic root of 623556 is about 85.4329010851.

The spelling of 623556 in words is "six hundred twenty-three thousand, five hundred fifty-six".