605640 has 96 divisors (see below), whose sum is σ = 2134080. Its totient is φ = 137088.

The previous prime is 605639. The next prime is 605641. The reversal of 605640 is 46506.

605640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (605639) and next prime (605641).

It is a hoax number, since the sum of its digits (21) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is an Ulam number.

It is a zygodrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (605641) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5829 + ... + 5931.

It is an arithmetic number, because the mean of its divisors is an integer number (22230).

2⁶⁰⁵⁶⁴⁰ is an apocalyptic number.

605640 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 605640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1067040).

605640 is an abundant number, since it is smaller than the sum of its proper divisors (1528440).

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

605640 is a wasteful number, since it uses less digits than its factorization.

605640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131 (or 120 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 605640 is about 778.2287581425. The cubic root of 605640 is about 84.6067183326.

The spelling of 605640 in words is "six hundred five thousand, six hundred forty".