616638 has 16 divisors (see below), whose sum is σ = 1345536. Its totient is φ = 186840.

The previous prime is 616597. The next prime is 616639. The reversal of 616638 is 836616.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 616638.

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

616638 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4606 + ... + 4737.

It is an arithmetic number, because the mean of its divisors is an integer number (84096).

2⁶¹⁶⁶³⁸ is an apocalyptic number.

616638 is an abundant number, since it is smaller than the sum of its proper divisors (728898).

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

616638 is a wasteful number, since it uses less digits than its factorization.

616638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9359.

The product of its digits is 5184, while the sum is 30.

The square root of 616638 is about 785.2630132637. The cubic root of 616638 is about 85.1157822394.

The spelling of 616638 in words is "six hundred sixteen thousand, six hundred thirty-eight".