618820 has 12 divisors (see below), whose sum is σ = 1299564. Its totient is φ = 247520.

The previous prime is 618799. The next prime is 618823. The reversal of 618820 is 28816.

It can be written as a sum of positive squares in 2 ways, for example, as 198916 + 419904 = 446^2 + 648^2 .

It is not an unprimeable number, because it can be changed into a prime (618823) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15451 + ... + 15490.

It is an arithmetic number, because the mean of its divisors is an integer number (108297).

2⁶¹⁸⁸²⁰ is an apocalyptic number.

It is an amenable number.

618820 is an abundant number, since it is smaller than the sum of its proper divisors (680744).

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

618820 is a wasteful number, since it uses less digits than its factorization.

618820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30950 (or 30948 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 25.

The square root of 618820 is about 786.6511297901. The cubic root of 618820 is about 85.2160593355.

The spelling of 618820 in words is "six hundred eighteen thousand, eight hundred twenty".