623856 has 40 divisors (see below), whose sum is σ = 1656144. Its totient is φ = 202240.

The previous prime is 623851. The next prime is 623867. The reversal of 623856 is 658326.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (623851) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1810 + ... + 2126.

2⁶²³⁸⁵⁶ 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 623856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (828072).

623856 is an abundant number, since it is smaller than the sum of its proper divisors (1032288).

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

623856 is a wasteful number, since it uses less digits than its factorization.

623856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 369 (or 363 counting only the distinct ones).

The product of its digits is 8640, while the sum is 30.

The square root of 623856 is about 789.8455545232. The cubic root of 623856 is about 85.4465998072.

The spelling of 623856 in words is "six hundred twenty-three thousand, eight hundred fifty-six".