613908 has 18 divisors (see below), whose sum is σ = 1551914. Its totient is φ = 204624.

The previous prime is 613903. The next prime is 613957. The reversal of 613908 is 809316.

It can be written as a sum of positive squares in only one way, i.e., 492804 + 121104 = 702^2 + 348^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (613903) by changing a digit.

613908 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 5 ways as a sum of consecutive naturals, for example, 8491 + ... + 8562.

2⁶¹³⁹⁰⁸ is an apocalyptic number.

It is an amenable number.

613908 is an abundant number, since it is smaller than the sum of its proper divisors (938006).

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

613908 is a wasteful number, since it uses less digits than its factorization.

613908 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17063 (or 17058 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 613908 is about 783.5228139627. The cubic root of 613908 is about 84.9899872866.

It can be divided in two parts, 613 and 908, that added together give a square (1521 = 39²).

The spelling of 613908 in words is "six hundred thirteen thousand, nine hundred eight".