620711740 has 48 divisors (see below), whose sum is σ = 1425846240. Its totient is φ = 225102080.

The previous prime is 620711731. The next prime is 620711747. The reversal of 620711740 is 47117026.

It is a junction number, because it is equal to n+sod(n) for n = 620711699 and 620711708.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (620711747) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 81954 + ... + 89206.

It is an arithmetic number, because the mean of its divisors is an integer number (29705130).

Almost surely, 2^620711740 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 620711740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (712923120).

620711740 is an abundant number, since it is smaller than the sum of its proper divisors (805134500).

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

620711740 is a wasteful number, since it uses less digits than its factorization.

620711740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7662 (or 7660 counting only the distinct ones).

The product of its (nonzero) digits is 2352, while the sum is 28.

The square root of 620711740 is about 24914.0871797463. The cubic root of 620711740 is about 853.0280649746.

Adding to 620711740 its reverse (47117026), we get a palindrome (667828766).

The spelling of 620711740 in words is "six hundred twenty million, seven hundred eleven thousand, seven hundred forty".