866840878 has 8 divisors (see below), whose sum is σ = 1315927368. Its totient is φ = 428198424.

The previous prime is 866840869. The next prime is 866840903. The reversal of 866840878 is 878048668.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2610801 + ... + 2611132.

It is an arithmetic number, because the mean of its divisors is an integer number (164490921).

Almost surely, 2^866840878 is an apocalyptic number.

866840878 is a deficient number, since it is larger than the sum of its proper divisors (449086490).

866840878 is a wasteful number, since it uses less digits than its factorization.

866840878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5222018.

The product of its (nonzero) digits is 4128768, while the sum is 55.

The square root of 866840878 is about 29442.1615714607. The cubic root of 866840878 is about 953.4833809770.

The spelling of 866840878 in words is "eight hundred sixty-six million, eight hundred forty thousand, eight hundred seventy-eight".