616820 has 12 divisors (see below), whose sum is σ = 1295364. Its totient is φ = 246720.

The previous prime is 616799. The next prime is 616829. The reversal of 616820 is 28616.

616820 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 364816 + 252004 = 604^2 + 502^2 .

It is a hoax number, since the sum of its digits (23) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (616829) by changing a digit.

616820 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 3 ways as a sum of consecutive naturals, for example, 15401 + ... + 15440.

It is an arithmetic number, because the mean of its divisors is an integer number (107947).

2⁶¹⁶⁸²⁰ is an apocalyptic number.

It is an amenable number.

616820 is an abundant number, since it is smaller than the sum of its proper divisors (678544).

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

616820 is a wasteful number, since it uses less digits than its factorization.

616820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30850 (or 30848 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 616820 is about 785.3788894540. The cubic root of 616820 is about 85.1241553576.

The spelling of 616820 in words is "six hundred sixteen thousand, eight hundred twenty".