620646 has 32 divisors (see below), whose sum is σ = 1367520. Its totient is φ = 186624.

The previous prime is 620639. The next prime is 620647. The reversal of 620646 is 646026.

620646 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a plaindrome in base 14.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 620646.

It is not an unprimeable number, because it can be changed into a prime (620647) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5640 + ... + 5748.

It is an arithmetic number, because the mean of its divisors is an integer number (42735).

2⁶²⁰⁶⁴⁶ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 620646, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (683760).

620646 is an abundant number, since it is smaller than the sum of its proper divisors (746874).

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

620646 is a wasteful number, since it uses less digits than its factorization.

620646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200.

The product of its (nonzero) digits is 1728, while the sum is 24.

The square root of 620646 is about 787.8108910138. The cubic root of 620646 is about 85.2997948985.

The spelling of 620646 in words is "six hundred twenty thousand, six hundred forty-six".