863781863 has 16 divisors (see below), whose sum is σ = 1011502080. Its totient is φ = 722301216.

The previous prime is 863781851. The next prime is 863781869. The reversal of 863781863 is 368187368.

It is not a de Polignac number, because 863781863 - 2⁴ = 863781847 is a prime.

It is a super-2 number, since 2×863781863² = 1492238213695501538, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (863781869) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 59906 + ... + 72912.

It is an arithmetic number, because the mean of its divisors is an integer number (63218880).

Almost surely, 2^863781863 is an apocalyptic number.

863781863 is a deficient number, since it is larger than the sum of its proper divisors (147720217).

863781863 is a wasteful number, since it uses less digits than its factorization.

863781863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13246.

The product of its digits is 1161216, while the sum is 50.

The square root of 863781863 is about 29390.1660934402. The cubic root of 863781863 is about 952.3604691326.

The spelling of 863781863 in words is "eight hundred sixty-three million, seven hundred eighty-one thousand, eight hundred sixty-three".