684159616 has 64 divisors (see below), whose sum is σ = 1587185280. Its totient is φ = 287659008.

The previous prime is 684159571. The next prime is 684159629. The reversal of 684159616 is 616951486.

It is a tau number, because it is divible by the number of its divisors (64).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40285 + ... + 54691.

It is an arithmetic number, because the mean of its divisors is an integer number (24799770).

Almost surely, 2^684159616 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 684159616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (793592640).

684159616 is an abundant number, since it is smaller than the sum of its proper divisors (903025664).

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

684159616 is a wasteful number, since it uses less digits than its factorization.

684159616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14481 (or 14469 counting only the distinct ones).

The product of its digits is 311040, while the sum is 46.

The square root of 684159616 is about 26156.4450183889. The cubic root of 684159616 is about 881.1553420049.

The spelling of 684159616 in words is "six hundred eighty-four million, one hundred fifty-nine thousand, six hundred sixteen".