863878788 has 36 divisors (see below), whose sum is σ = 2213613948. Its totient is φ = 284014080.

The previous prime is 863878759. The next prime is 863878789. The reversal of 863878788 is 887878368.

It can be written as a sum of positive squares in 2 ways, for example, as 393943104 + 469935684 = 19848^2 + 21678^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (863878789) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 161733 + ... + 166988.

Almost surely, 2^863878788 is an apocalyptic number.

It is an amenable number.

863878788 is an abundant number, since it is smaller than the sum of its proper divisors (1349735160).

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

863878788 is a wasteful number, since it uses less digits than its factorization.

863878788 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 328804 (or 328799 counting only the distinct ones).

The product of its digits is 28901376, while the sum is 63.

The square root of 863878788 is about 29391.8149830867. The cubic root of 863878788 is about 952.3960892701.

The spelling of 863878788 in words is "eight hundred sixty-three million, eight hundred seventy-eight thousand, seven hundred eighty-eight".