678191616 has 280 divisors, whose sum is σ = 2146826880. Its totient is φ = 213497856.

The previous prime is 678191603. The next prime is 678191617. The reversal of 678191616 is 616191876.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (678191617) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 8584665 + ... + 8584743.

Almost surely, 2^678191616 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 678191616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1073413440).

678191616 is an abundant number, since it is smaller than the sum of its proper divisors (1468635264).

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

678191616 is an frugal number, since it uses more digits than its factorization.

678191616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138 (or 107 counting only the distinct ones).

The product of its digits is 108864, while the sum is 45.

The square root of 678191616 is about 26042.1123567195. The cubic root of 678191616 is about 878.5857172487.

The spelling of 678191616 in words is "six hundred seventy-eight million, one hundred ninety-one thousand, six hundred sixteen".