623820 has 48 divisors (see below), whose sum is σ = 1800288. Its totient is φ = 161280.

The previous prime is 623803. The next prime is 623839. The reversal of 623820 is 28326.

It is a congruent number.

It is an unprimeable number.

623820 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 15 ways as a sum of consecutive naturals, for example, 2080 + ... + 2360.

It is an arithmetic number, because the mean of its divisors is an integer number (37506).

2⁶²³⁸²⁰ is an apocalyptic number.

623820 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 623820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (900144).

623820 is an abundant number, since it is smaller than the sum of its proper divisors (1176468).

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

623820 is a wasteful number, since it uses less digits than its factorization.

623820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 330 (or 328 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 623820 is about 789.8227649289. The cubic root of 623820 is about 85.4449561925. Note that the first 3 decimals are identical.

The spelling of 623820 in words is "six hundred twenty-three thousand, eight hundred twenty".