643849302870 has 192 divisors, whose sum is σ = 1740929112000. Its totient is φ = 164951728128.

The previous prime is 643849302869. The next prime is 643849302913. The reversal of 643849302870 is 78203948346.

643849302870 is a `hidden beast` number, since 64 + 3 + 8 + 493 + 0 + 28 + 70 = 666.

643849302870 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 432403086 + ... + 432404574.

It is an arithmetic number, because the mean of its divisors is an integer number (9067339125).

Almost surely, 2^643849302870 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 643849302870, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (870464556000).

643849302870 is an abundant number, since it is smaller than the sum of its proper divisors (1097079809130).

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

643849302870 is a wasteful number, since it uses less digits than its factorization.

643849302870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3087 (or 3084 counting only the distinct ones).

The product of its (nonzero) digits is 6967296, while the sum is 54.

The spelling of 643849302870 in words is "six hundred forty-three billion, eight hundred forty-nine million, three hundred two thousand, eight hundred seventy".