678157704 has 128 divisors (see below), whose sum is σ = 2160288000. Its totient is φ = 193093632.

The previous prime is 678157703. The next prime is 678157723. The reversal of 678157704 is 407751876.

678157704 is a `hidden beast` number, since 6 + 78 + 1 + 577 + 0 + 4 = 666.

678157704 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 678157704.

It is not an unprimeable number, because it can be changed into a prime (678157703) 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, 587592 + ... + 588744.

It is an arithmetic number, because the mean of its divisors is an integer number (16877250).

Almost surely, 2^678157704 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 678157704, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1080144000).

678157704 is an abundant number, since it is smaller than the sum of its proper divisors (1482130296).

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

678157704 is a wasteful number, since it uses less digits than its factorization.

678157704 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1564 (or 1554 counting only the distinct ones).

The product of its (nonzero) digits is 329280, while the sum is 45.

The square root of 678157704 is about 26041.4612493232. The cubic root of 678157704 is about 878.5710728646.

The spelling of 678157704 in words is "six hundred seventy-eight million, one hundred fifty-seven thousand, seven hundred four".