809861213070 has 384 divisors, whose sum is σ = 2728235188224. Its totient is φ = 161991954432.

The previous prime is 809861213059. The next prime is 809861213099. The reversal of 809861213070 is 70312168908.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 21266787 + ... + 21304833.

It is an arithmetic number, because the mean of its divisors is an integer number (7104779136).

Almost surely, 2^809861213070 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 809861213070, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1364117594112).

809861213070 is an abundant number, since it is smaller than the sum of its proper divisors (1918373975154).

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

809861213070 is a wasteful number, since it uses less digits than its factorization.

809861213070 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38216 (or 38213 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 45.

The spelling of 809861213070 in words is "eight hundred nine billion, eight hundred sixty-one million, two hundred thirteen thousand, seventy".