678521070 has 64 divisors (see below), whose sum is σ = 1812767040. Its totient is φ = 180601344.

The previous prime is 678521023. The next prime is 678521071. The reversal of 678521070 is 70125876.

678521070 is a `hidden beast` number, since 67 + 8 + 521 + 0 + 70 = 666.

678521070 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (678521071) 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, 164554 + ... + 168626.

It is an arithmetic number, because the mean of its divisors is an integer number (28324485).

Almost surely, 2^678521070 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 678521070, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (906383520).

678521070 is an abundant number, since it is smaller than the sum of its proper divisors (1134245970).

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

678521070 is a wasteful number, since it uses less digits than its factorization.

678521070 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4706 (or 4700 counting only the distinct ones).

The product of its (nonzero) digits is 23520, while the sum is 36.

The square root of 678521070 is about 26048.4369972557. The cubic root of 678521070 is about 878.7279615713.

The spelling of 678521070 in words is "six hundred seventy-eight million, five hundred twenty-one thousand, seventy".