678877680 has 160 divisors (see below), whose sum is σ = 2339850240. Its totient is φ = 161694720.

The previous prime is 678877669. The next prime is 678877681. The reversal of 678877680 is 86778876.

It is a self number, because there is not a number n which added to its sum of digits gives 678877680.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (678877681) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 93211 + ... + 100229.

It is an arithmetic number, because the mean of its divisors is an integer number (14624064).

Almost surely, 2^678877680 is an apocalyptic number.

678877680 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 678877680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1169925120).

678877680 is an abundant number, since it is smaller than the sum of its proper divisors (1660972560).

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

678877680 is a wasteful number, since it uses less digits than its factorization.

678877680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7079 (or 7073 counting only the distinct ones).

The product of its (nonzero) digits is 6322176, while the sum is 57.

The square root of 678877680 is about 26055.2812304914. The cubic root of 678877680 is about 878.8818788237.

The spelling of 678877680 in words is "six hundred seventy-eight million, eight hundred seventy-seven thousand, six hundred eighty".