6863816820 has 48 divisors (see below), whose sum is σ = 21964215168. Its totient is φ = 1568872320.

The previous prime is 6863816737. The next prime is 6863816851. The reversal of 6863816820 is 286183686.

It is a super-2 number, since 2×6863816820² = 94223962677029824800, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 6863816820.

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, 8170791 + ... + 8171630.

It is an arithmetic number, because the mean of its divisors is an integer number (457587816).

Almost surely, 2^6863816820 is an apocalyptic number.

6863816820 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6863816820 is an abundant number, since it is smaller than the sum of its proper divisors (15100398348).

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

6863816820 is a wasteful number, since it uses less digits than its factorization.

6863816820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16342440 (or 16342438 counting only the distinct ones).

The product of its (nonzero) digits is 663552, while the sum is 48.

The square root of 6863816820 is about 82848.1551997388. The cubic root of 6863816820 is about 1900.4446623160. Note that the first 3 decimals are identical.

It can be divided in two parts, 68638 and 16820, that added together give a palindrome (85458).

The spelling of 6863816820 in words is "six billion, eight hundred sixty-three million, eight hundred sixteen thousand, eight hundred twenty".