621860 has 48 divisors (see below), whose sum is σ = 1451520. Its totient is φ = 222720.

The previous prime is 621833. The next prime is 621869. The reversal of 621860 is 68126.

621860 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (621869) by changing a digit.

621860 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, 10511 + ... + 10569.

It is an arithmetic number, because the mean of its divisors is an integer number (30240).

2⁶²¹⁸⁶⁰ 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 621860, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (725760).

621860 is an abundant number, since it is smaller than the sum of its proper divisors (829660).

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

621860 is a wasteful number, since it uses less digits than its factorization.

621860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116 (or 114 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 621860 is about 788.5810040826. The cubic root of 621860 is about 85.3553748943.

Adding to 621860 its reverse (68126), we get a palindrome (689986).

The spelling of 621860 in words is "six hundred twenty-one thousand, eight hundred sixty".