613520 has 20 divisors (see below), whose sum is σ = 1426620. Its totient is φ = 245376.

The previous prime is 613507. The next prime is 613523. The reversal of 613520 is 25316.

It can be written as a sum of positive squares in 2 ways, for example, as 430336 + 183184 = 656^2 + 428^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is not an unprimeable number, because it can be changed into a prime (613523) by changing a digit.

613520 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 3 ways as a sum of consecutive naturals, for example, 3755 + ... + 3914.

It is an arithmetic number, because the mean of its divisors is an integer number (71331).

2⁶¹³⁵²⁰ is an apocalyptic number.

It is an amenable number.

613520 is an abundant number, since it is smaller than the sum of its proper divisors (813100).

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

613520 is a wasteful number, since it uses less digits than its factorization.

613520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7682 (or 7676 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 17.

The square root of 613520 is about 783.2751751460. The cubic root of 613520 is about 84.9720784877.

Adding to 613520 its reverse (25316), we get a palindrome (638836).

The spelling of 613520 in words is "six hundred thirteen thousand, five hundred twenty".