678861321236280 has 1280 divisors, whose sum is σ = 2815101685186560. Its totient is φ = 142884933120000.

The previous prime is 678861321236279. The next prime is 678861321236299. The reversal of 678861321236280 is 82632123168876.

678861321236280 is a `hidden beast` number, since 6 + 7 + 8 + 8 + 6 + 1 + 321 + 23 + 6 + 280 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 319 ways as a sum of consecutive naturals, for example, 301582105155 + ... + 301582107405.

It is an arithmetic number, because the mean of its divisors is an integer number (2199298191552).

Almost surely, 2^{678861321236280} is an apocalyptic number.

678861321236280 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 678861321236280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1407550842593280).

678861321236280 is an abundant number, since it is smaller than the sum of its proper divisors (2136240363950280).

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

678861321236280 is a wasteful number, since it uses less digits than its factorization.

678861321236280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4322 (or 4309 counting only the distinct ones).

The product of its (nonzero) digits is 55738368, while the sum is 63.

The spelling of 678861321236280 in words is "six hundred seventy-eight trillion, eight hundred sixty-one billion, three hundred twenty-one million, two hundred thirty-six thousand, two hundred eighty".