866533878 has 48 divisors (see below), whose sum is σ = 2239001856. Its totient is φ = 236815920.

The previous prime is 866533873. The next prime is 866533897. The reversal of 866533878 is 878335668.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (866533873) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 146608 + ... + 152403.

It is an arithmetic number, because the mean of its divisors is an integer number (46645872).

Almost surely, 2^866533878 is an apocalyptic number.

866533878 is an abundant number, since it is smaller than the sum of its proper divisors (1372467978).

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

866533878 is a wasteful number, since it uses less digits than its factorization.

866533878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 299049 (or 299046 counting only the distinct ones).

The product of its digits is 5806080, while the sum is 54.

The square root of 866533878 is about 29436.9474979999. The cubic root of 866533878 is about 953.3708059287.

The spelling of 866533878 in words is "eight hundred sixty-six million, five hundred thirty-three thousand, eight hundred seventy-eight".