866782278 has 48 divisors (see below), whose sum is σ = 1963110240. Its totient is φ = 275882112.

The previous prime is 866782277. The next prime is 866782307. The reversal of 866782278 is 872287668.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (866782277) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 292050 + ... + 295002.

It is an arithmetic number, because the mean of its divisors is an integer number (40898130).

Almost surely, 2^866782278 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 866782278, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (981555120).

866782278 is an abundant number, since it is smaller than the sum of its proper divisors (1096327962).

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

866782278 is a wasteful number, since it uses less digits than its factorization.

866782278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3693 (or 3690 counting only the distinct ones).

The product of its digits is 3612672, while the sum is 54.

The square root of 866782278 is about 29441.1663831445. The cubic root of 866782278 is about 953.4618947632.

The spelling of 866782278 in words is "eight hundred sixty-six million, seven hundred eighty-two thousand, two hundred seventy-eight".