863971220 has 48 divisors (see below), whose sum is σ = 2108695680. Its totient is φ = 291195264.

The previous prime is 863971189. The next prime is 863971247. The reversal of 863971220 is 22179368.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44039 + ... + 60558.

It is an arithmetic number, because the mean of its divisors is an integer number (43931160).

Almost surely, 2^863971220 is an apocalyptic number.

It is an amenable number.

863971220 is an abundant number, since it is smaller than the sum of its proper divisors (1244724460).

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

863971220 is a wasteful number, since it uses less digits than its factorization.

863971220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104672 (or 104670 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 38.

The square root of 863971220 is about 29393.3873515796. The cubic root of 863971220 is about 952.4300557389.

The spelling of 863971220 in words is "eight hundred sixty-three million, nine hundred seventy-one thousand, two hundred twenty".