861650000 has 120 divisors (see below), whose sum is σ = 2198921760. Its totient is φ = 326160000.

The previous prime is 861649993. The next prime is 861650021. The reversal of 861650000 is 56168.

It is a congruent number.

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, 949547 + ... + 950453.

It is an arithmetic number, because the mean of its divisors is an integer number (18324348).

Almost surely, 2^861650000 is an apocalyptic number.

861650000 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 861650000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1099460880).

861650000 is an abundant number, since it is smaller than the sum of its proper divisors (1337271760).

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

861650000 is an equidigital number, since it uses as much as digits as its factorization.

861650000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 959 (or 933 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 861650000 is about 29353.8753829882. The cubic root of 861650000 is about 951.5763303246.

The spelling of 861650000 in words is "eight hundred sixty-one million, six hundred fifty thousand".