613866 has 32 divisors (see below), whose sum is σ = 1368576. Its totient is φ = 182000.

The previous prime is 613861. The next prime is 613883. The reversal of 613866 is 668316.

It is not an unprimeable number, because it can be changed into a prime (613861) by changing a digit.

613866 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 15 ways as a sum of consecutive naturals, for example, 4621 + ... + 4751.

It is an arithmetic number, because the mean of its divisors is an integer number (42768).

2⁶¹³⁸⁶⁶ is an apocalyptic number.

613866 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 613866, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (684288).

613866 is an abundant number, since it is smaller than the sum of its proper divisors (754710).

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

613866 is a wasteful number, since it uses less digits than its factorization.

613866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218.

The product of its digits is 5184, while the sum is 30.

The square root of 613866 is about 783.4960114768. The cubic root of 613866 is about 84.9880490695.

The spelling of 613866 in words is "six hundred thirteen thousand, eight hundred sixty-six".