999999616 has 128 divisors (see below), whose sum is σ = 2499995520. Its totient is φ = 387072000.

The previous prime is 999999613. The next prime is 999999667. The reversal of 999999616 is 616999999.

It is a tau number, because it is divible by the number of its divisors (128).

It is not an unprimeable number, because it can be changed into a prime (999999613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2375086 + ... + 2375506.

It is an arithmetic number, because the mean of its divisors is an integer number (19531215).

Almost surely, 2^999999616 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 999999616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1249997760).

999999616 is an abundant number, since it is smaller than the sum of its proper divisors (1499995904).

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

999999616 is a wasteful number, since it uses less digits than its factorization.

999999616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 694 (or 682 counting only the distinct ones).

The product of its digits is 19131876, while the sum is 67.

The square root of 999999616 is about 31622.7705301101. The cubic root of 999999616 is about 999.9998720000. Note that the first 3 decimals are identical.

The spelling of 999999616 in words is "nine hundred ninety-nine million, nine hundred ninety-nine thousand, six hundred sixteen".