863312820 has 48 divisors (see below), whose sum is σ = 2522378880. Its totient is φ = 220206976.

The previous prime is 863312777. The next prime is 863312833. The reversal of 863312820 is 28213368.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 311415 + ... + 314174.

It is an arithmetic number, because the mean of its divisors is an integer number (52549560).

Almost surely, 2^863312820 is an apocalyptic number.

It is an amenable number.

863312820 is an abundant number, since it is smaller than the sum of its proper divisors (1659066060).

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

863312820 is a wasteful number, since it uses less digits than its factorization.

863312820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 625624 (or 625622 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 33.

The square root of 863312820 is about 29382.1854190596. The cubic root of 863312820 is about 952.1880572043.

The spelling of 863312820 in words is "eight hundred sixty-three million, three hundred twelve thousand, eight hundred twenty".