863664878 has 8 divisors (see below), whose sum is σ = 1330510872. Its totient is φ = 420161256.

The previous prime is 863664869. The next prime is 863664887. The reversal of 863664878 is 878466368.

It is an interprime number because it is at equal distance from previous prime (863664869) and next prime (863664887).

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

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 3 ways as a sum of consecutive naturals, for example, 5835500 + ... + 5835647.

It is an arithmetic number, because the mean of its divisors is an integer number (166313859).

Almost surely, 2^863664878 is an apocalyptic number.

863664878 is a deficient number, since it is larger than the sum of its proper divisors (466845994).

863664878 is a wasteful number, since it uses less digits than its factorization.

863664878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11671186.

The product of its digits is 9289728, while the sum is 56.

The square root of 863664878 is about 29388.1758195367. The cubic root of 863664878 is about 952.3174733547.

The spelling of 863664878 in words is "eight hundred sixty-three million, six hundred sixty-four thousand, eight hundred seventy-eight".