616647 has 4 divisors (see below), whose sum is σ = 822200. Its totient is φ = 411096.

The previous prime is 616643. The next prime is 616669. The reversal of 616647 is 746616.

616647 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 616647 - 2² = 616643 is a prime.

It is a D-number.

It is a Duffinian 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 3 ways as a sum of consecutive naturals, for example, 102772 + ... + 102777.

It is an arithmetic number, because the mean of its divisors is an integer number (205550).

2⁶¹⁶⁶⁴⁷ is an apocalyptic number.

616647 is a deficient number, since it is larger than the sum of its proper divisors (205553).

616647 is a wasteful number, since it uses less digits than its factorization.

616647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205552.

The product of its digits is 6048, while the sum is 30.

The square root of 616647 is about 785.2687438069. The cubic root of 616647 is about 85.1161963334.

It can be divided in two parts, 6 and 16647, that added together give a triangular number (16653 = T₁₈₂).

The spelling of 616647 in words is "six hundred sixteen thousand, six hundred forty-seven".