616689 has 6 divisors (see below), whose sum is σ = 890786. Its totient is φ = 411120.

The previous prime is 616673. The next prime is 616703. The reversal of 616689 is 986616.

616689 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 only one way, i.e., 613089 + 3600 = 783^2 + 60^2 .

It is not a de Polignac number, because 616689 - 2⁴ = 616673 is a prime.

It is a Duffinian number.

616689 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (616639) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 34252 + ... + 34269.

2⁶¹⁶⁶⁸⁹ is an apocalyptic number.

It is an amenable number.

616689 is a deficient number, since it is larger than the sum of its proper divisors (274097).

616689 is a wasteful number, since it uses less digits than its factorization.

616689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68527 (or 68524 counting only the distinct ones).

The product of its digits is 15552, while the sum is 36.

The square root of 616689 is about 785.2954857886. The cubic root of 616689 is about 85.1181287188.

It can be divided in two parts, 616 and 689, that multiplied together give a palindrome (424424).

The spelling of 616689 in words is "six hundred sixteen thousand, six hundred eighty-nine".