621280 has 48 divisors (see below), whose sum is σ = 1605744. Its totient is φ = 225280.

The previous prime is 621259. The next prime is 621289. The reversal of 621280 is 82126.

It is a happy number.

621280 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621289) by changing a digit.

621280 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, 1584 + ... + 1936.

It is an arithmetic number, because the mean of its divisors is an integer number (33453).

2⁶²¹²⁸⁰ 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 621280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (802872).

621280 is an abundant number, since it is smaller than the sum of its proper divisors (984464).

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

621280 is a wasteful number, since it uses less digits than its factorization.

621280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 379 (or 371 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 621280 is about 788.2131691364. The cubic root of 621280 is about 85.3288300575.

The spelling of 621280 in words is "six hundred twenty-one thousand, two hundred eighty".