616645 has 8 divisors (see below), whose sum is σ = 779040. Its totient is φ = 467280.

The previous prime is 616643. The next prime is 616669. The reversal of 616645 is 546616.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 616645 - 2¹ = 616643 is a prime.

616645 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (616643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3151 + ... + 3340.

It is an arithmetic number, because the mean of its divisors is an integer number (97380).

2⁶¹⁶⁶⁴⁵ is an apocalyptic number.

It is an amenable number.

616645 is a deficient number, since it is larger than the sum of its proper divisors (162395).

616645 is a wasteful number, since it uses less digits than its factorization.

616645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6515.

The product of its digits is 4320, while the sum is 28.

The square root of 616645 is about 785.2674703564. The cubic root of 616645 is about 85.1161043128.

The spelling of 616645 in words is "six hundred sixteen thousand, six hundred forty-five".