863221878 has 24 divisors (see below), whose sum is σ = 1951633008. Its totient is φ = 275230032.

The previous prime is 863221867. The next prime is 863221883. The reversal of 863221878 is 878122368.

863221878 is a `hidden beast` number, since 8 + 632 + 2 + 1 + 8 + 7 + 8 = 666.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1042125 + ... + 1042952.

It is an arithmetic number, because the mean of its divisors is an integer number (81318042).

Almost surely, 2^863221878 is an apocalyptic number.

863221878 is an abundant number, since it is smaller than the sum of its proper divisors (1088411130).

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

863221878 is a wasteful number, since it uses less digits than its factorization.

863221878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2085108 (or 2085105 counting only the distinct ones).

The product of its digits is 258048, while the sum is 45.

The square root of 863221878 is about 29380.6378079170. The cubic root of 863221878 is about 952.1546213029.

The spelling of 863221878 in words is "eight hundred sixty-three million, two hundred twenty-one thousand, eight hundred seventy-eight".