866498850 has 144 divisors (see below), whose sum is σ = 2777724000. Its totient is φ = 198041760.

The previous prime is 866498821. The next prime is 866498861. The reversal of 866498850 is 58894668.

It is a happy number.

866498850 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 59601 + ... + 72699.

It is an arithmetic number, because the mean of its divisors is an integer number (19289750).

Almost surely, 2^866498850 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 866498850, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1388862000).

866498850 is an abundant number, since it is smaller than the sum of its proper divisors (1911225150).

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

866498850 is a wasteful number, since it uses less digits than its factorization.

866498850 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13134 (or 13116 counting only the distinct ones).

The product of its (nonzero) digits is 3317760, while the sum is 54.

The square root of 866498850 is about 29436.3525254064. The cubic root of 866498850 is about 953.3579596825.

The spelling of 866498850 in words is "eight hundred sixty-six million, four hundred ninety-eight thousand, eight hundred fifty".