616720 has 40 divisors (see below), whose sum is σ = 1546776. Its totient is φ = 227328.
The previous prime is 616717. The next prime is 616723. The reversal of 616720 is 27616.
It is an interprime number because it is at equal distance from previous prime (616717) and next prime (616723).
It can be written as a sum of positive squares in 4 ways, for example, as 20736 + 595984 = 144^2 + 772^2 .
It is a tau number, because it is divible by the number of its divisors (40).
It is a junction number, because it is equal to n+sod(n) for n = 616691 and 616700.
It is not an unprimeable number, because it can be changed into a prime (616723) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (7) of ones.
It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 744 + ... + 1336.
2616720 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 616720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (773388).
616720 is an abundant number, since it is smaller than the sum of its proper divisors (930056).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
616720 is a wasteful number, since it uses less digits than its factorization.
616720 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 619 (or 613 counting only the distinct ones).
The product of its (nonzero) digits is 504, while the sum is 22.
The square root of 616720 is about 785.3152233339. The cubic root of 616720 is about 85.1195549471.
The spelling of 616720 in words is "six hundred sixteen thousand, seven hundred twenty".
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