616640 has 56 divisors (see below), whose sum is σ = 1536192. Its totient is φ = 235520.

The previous prime is 616639. The next prime is 616643. The reversal of 616640 is 46616.

It is a hoax number, since the sum of its digits (23) coincides with the sum of the digits of its distinct prime factors.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 616640.

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

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13097 + ... + 13143.

It is an arithmetic number, because the mean of its divisors is an integer number (27432).

2⁶¹⁶⁶⁴⁰ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 616640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (768096).

616640 is an abundant number, since it is smaller than the sum of its proper divisors (919552).

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

616640 is a wasteful number, since it uses less digits than its factorization.

616640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105 (or 95 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 616640 is about 785.2642867214. The cubic root of 616640 is about 85.1158742606.

The spelling of 616640 in words is "six hundred sixteen thousand, six hundred forty".