678159720 has 192 divisors, whose sum is σ = 2600432640. Its totient is φ = 149990400.

The previous prime is 678159709. The next prime is 678159731. The reversal of 678159720 is 27951876.

678159720 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (678159709) and next prime (678159731).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 73780 + ... + 82460.

It is an arithmetic number, because the mean of its divisors is an integer number (13543920).

Almost surely, 2^678159720 is an apocalyptic number.

678159720 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 678159720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1300216320).

678159720 is an abundant number, since it is smaller than the sum of its proper divisors (1922272920).

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

678159720 is a wasteful number, since it uses less digits than its factorization.

678159720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8736 (or 8729 counting only the distinct ones).

The product of its (nonzero) digits is 211680, while the sum is 45.

The square root of 678159720 is about 26041.4999567997. The cubic root of 678159720 is about 878.5719434574.

The spelling of 678159720 in words is "six hundred seventy-eight million, one hundred fifty-nine thousand, seven hundred twenty".