86215650820 has 72 divisors (see below), whose sum is σ = 196132547016. Its totient is φ = 31820285952.

The previous prime is 86215650779. The next prime is 86215650863. The reversal of 86215650820 is 2805651268.

It can be written as a sum of positive squares in 12 ways, for example, as 64271376324 + 21944274496 = 253518^2 + 148136^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12614124 + ... + 12620956.

It is an arithmetic number, because the mean of its divisors is an integer number (2724063153).

Almost surely, 2^86215650820 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 86215650820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (98066273508).

86215650820 is an abundant number, since it is smaller than the sum of its proper divisors (109916896196).

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

86215650820 is a wasteful number, since it uses less digits than its factorization.

86215650820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10601 (or 10586 counting only the distinct ones).

The product of its (nonzero) digits is 230400, while the sum is 43.

The spelling of 86215650820 in words is "eighty-six billion, two hundred fifteen million, six hundred fifty thousand, eight hundred twenty".