621960 has 64 divisors (see below), whose sum is σ = 1918080. Its totient is φ = 161280.

The previous prime is 621941. The next prime is 621983. The reversal of 621960 is 69126.

621960 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a nialpdrome in base 15.

It is a self number, because there is not a number n which added to its sum of digits gives 621960.

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 621960.

It is an unprimeable number.

621960 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, 8484 + ... + 8556.

It is an arithmetic number, because the mean of its divisors is an integer number (29970).

2⁶²¹⁹⁶⁰ is an apocalyptic number.

621960 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 621960, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (959040).

621960 is an abundant number, since it is smaller than the sum of its proper divisors (1296120).

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

621960 is a wasteful number, since it uses less digits than its factorization.

621960 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158 (or 154 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 24.

The square root of 621960 is about 788.6444065610. The cubic root of 621960 is about 85.3599499219.

The spelling of 621960 in words is "six hundred twenty-one thousand, nine hundred sixty".