859986347220 has 864 divisors, whose sum is σ = 3578257178496. Its totient is φ = 164341094400.

The previous prime is 859986347203. The next prime is 859986347239. The reversal of 859986347220 is 22743689958.

859986347220 is a `hidden beast` number, since 8 + 59 + 98 + 6 + 3 + 472 + 20 = 666.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 287 ways as a sum of consecutive naturals, for example, 387205710 + ... + 387207930.

It is an arithmetic number, because the mean of its divisors is an integer number (4141501364).

Almost surely, 2^859986347220 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 859986347220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1789128589248).

859986347220 is an abundant number, since it is smaller than the sum of its proper divisors (2718270831276).

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

859986347220 is a wasteful number, since it uses less digits than its factorization.

859986347220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2581 (or 2569 counting only the distinct ones).

The product of its (nonzero) digits is 52254720, while the sum is 63.

The spelling of 859986347220 in words is "eight hundred fifty-nine billion, nine hundred eighty-six million, three hundred forty-seven thousand, two hundred twenty".