861059080 has 64 divisors (see below), whose sum is σ = 2229120000. Its totient is φ = 293224704.

The previous prime is 861059077. The next prime is 861059099. The reversal of 861059080 is 80950168.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31401 + ... + 52039.

It is an arithmetic number, because the mean of its divisors is an integer number (34830000).

Almost surely, 2^861059080 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 861059080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1114560000).

861059080 is an abundant number, since it is smaller than the sum of its proper divisors (1368060920).

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

861059080 is a wasteful number, since it uses less digits than its factorization.

861059080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20806 (or 20802 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 37.

The square root of 861059080 is about 29343.8082054801. The cubic root of 861059080 is about 951.3587500707.

The spelling of 861059080 in words is "eight hundred sixty-one million, fifty-nine thousand, eighty".