678702619728 has 720 divisors, whose sum is σ = 2438094160320. Its totient is φ = 181721014272.

The previous prime is 678702619703. The next prime is 678702619729. The reversal of 678702619728 is 827916207876.

678702619728 is a `hidden beast` number, since 6 + 7 + 8 + 7 + 0 + 2 + 619 + 7 + 2 + 8 = 666.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (678702619729) by changing a digit.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 351112650 + ... + 351114582.

Almost surely, 2^678702619728 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 678702619728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1219047080160).

678702619728 is an abundant number, since it is smaller than the sum of its proper divisors (1759391540592).

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

678702619728 is a wasteful number, since it uses less digits than its factorization.

678702619728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2086 (or 2061 counting only the distinct ones).

The product of its (nonzero) digits is 28449792, while the sum is 63.

The spelling of 678702619728 in words is "six hundred seventy-eight billion, seven hundred two million, six hundred nineteen thousand, seven hundred twenty-eight".