613720 has 32 divisors (see below), whose sum is σ = 1407600. Its totient is φ = 240768.

The previous prime is 613699. The next prime is 613733. The reversal of 613720 is 27316.

613720 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 an unprimeable number.

613720 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, 2566 + ... + 2794.

2⁶¹³⁷²⁰ 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 613720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (703800).

613720 is an abundant number, since it is smaller than the sum of its proper divisors (793880).

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

613720 is a wasteful number, since it uses less digits than its factorization.

613720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 307 (or 303 counting only the distinct ones).

The product of its (nonzero) digits is 252, while the sum is 19.

The square root of 613720 is about 783.4028337963. The cubic root of 613720 is about 84.9813107699.

The spelling of 613720 in words is "six hundred thirteen thousand, seven hundred twenty".