618660 has 72 divisors (see below), whose sum is σ = 2149056. Its totient is φ = 141120.

The previous prime is 618643. The next prime is 618671. The reversal of 618660 is 66816.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1015 + ... + 1505.

It is an arithmetic number, because the mean of its divisors is an integer number (29848).

2⁶¹⁸⁶⁶⁰ is an apocalyptic number.

618660 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 618660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1074528).

618660 is an abundant number, since it is smaller than the sum of its proper divisors (1530396).

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

618660 is a wasteful number, since it uses less digits than its factorization.

618660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 513 (or 508 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 618660 is about 786.5494262918. The cubic root of 618660 is about 85.2087143107.

The spelling of 618660 in words is "six hundred eighteen thousand, six hundred sixty".