• 620 can be written using four 4's:

620 has 12 divisors (see below), whose sum is σ = 1344. Its totient is φ = 240.

The previous prime is 619. The next prime is 631. The reversal of 620 is 26.

620 = 5^{2} + 6^{2} + ... + 12^{2}.

620 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 13 and base 16.

It is a nialpdrome in base 5 and base 10.

It is a junction number, because it is equal to *n*+sod(*n*) for *n* = 598 and 607.

It is an inconsummate number, since it does not exist a number *n* which divided by its sum of digits gives 620.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5 + ... + 35.

It is an arithmetic number, because the mean of its divisors is an integer number (112).

2^{620} 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 620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (672).

620 is an abundant number, since it is smaller than the sum of its proper divisors (724).

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

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

620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40 (or 38 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 8.

The square root of 620 is about 24.8997991960. The cubic root of 620 is about 8.5270189833.

Adding to 620 its reverse (26), we get a palindrome (646).

It can be divided in two parts, 6 and 20, that multiplied together give a triangular number (120 = T_{15}).

The spelling of 620 in words is "six hundred twenty", and thus it is an aban number and an oban number.

• e-mail: info -at- numbersaplenty.com • Privacy notice • done in 0.097 sec. • engine limits •