623720 has 32 divisors (see below), whose sum is σ = 1451520. Its totient is φ = 240960.

The previous prime is 623719. The next prime is 623723. The reversal of 623720 is 27326.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 623692 and 623701.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (623723) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 989 + ... + 1491.

It is an arithmetic number, because the mean of its divisors is an integer number (45360).

2⁶²³⁷²⁰ 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 623720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (725760).

623720 is an abundant number, since it is smaller than the sum of its proper divisors (827800).

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

623720 is a wasteful number, since it uses less digits than its factorization.

623720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 545 (or 541 counting only the distinct ones).

The product of its (nonzero) digits is 504, while the sum is 20.

The square root of 623720 is about 789.7594570501. The cubic root of 623720 is about 85.4403902641.

The spelling of 623720 in words is "six hundred twenty-three thousand, seven hundred twenty".