621606 has 16 divisors (see below), whose sum is σ = 1251648. Its totient is φ = 205800.

The previous prime is 621583. The next prime is 621611. The reversal of 621606 is 606126.

621606 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

621606 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 7 ways as a sum of consecutive naturals, for example, 1021 + ... + 1511.

It is an arithmetic number, because the mean of its divisors is an integer number (78228).

2⁶²¹⁶⁰⁶ is an apocalyptic number.

621606 is an abundant number, since it is smaller than the sum of its proper divisors (630042).

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

621606 is a wasteful number, since it uses less digits than its factorization.

621606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 707.

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 621606 is about 788.4199388651. The cubic root of 621606 is about 85.3437521187.

It can be divided in two parts, 6 and 21606, that added together give a palindrome (21612).

The spelling of 621606 in words is "six hundred twenty-one thousand, six hundred six".