616505 has 8 divisors (see below), whose sum is σ = 783432. Its totient is φ = 464128.

The previous prime is 616501. The next prime is 616507. The reversal of 616505 is 505616.

It can be written as a sum of positive squares in 4 ways, for example, as 190096 + 426409 = 436^2 + 653^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 616505 - 2² = 616501 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 616505.

It is not an unprimeable number, because it can be changed into a prime (616501) 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, 3542 + ... + 3711.

It is an arithmetic number, because the mean of its divisors is an integer number (97929).

2⁶¹⁶⁵⁰⁵ is an apocalyptic number.

It is an amenable number.

616505 is a deficient number, since it is larger than the sum of its proper divisors (166927).

616505 is a wasteful number, since it uses less digits than its factorization.

616505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7275.

The product of its (nonzero) digits is 900, while the sum is 23.

The square root of 616505 is about 785.1783236947. The cubic root of 616505 is about 85.1096623803.

Subtracting from 616505 its reverse (505616), we obtain a square (110889 = 333²).

The spelling of 616505 in words is "six hundred sixteen thousand, five hundred five".