863891136 has 112 divisors (see below), whose sum is σ = 2621767680. Its totient is φ = 278657280.

The previous prime is 863891131. The next prime is 863891191. The reversal of 863891136 is 631198368.

It is a happy number.

863891136 is a `hidden beast` number, since 8 + 638 + 9 + 1 + 1 + 3 + 6 = 666.

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 863891091 and 863891100.

It is not an unprimeable number, because it can be changed into a prime (863891131) 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, 45505 + ... + 61631.

It is an arithmetic number, because the mean of its divisors is an integer number (23408640).

Almost surely, 2^863891136 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 863891136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1310883840).

863891136 is an abundant number, since it is smaller than the sum of its proper divisors (1757876544).

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

863891136 is a wasteful number, since it uses less digits than its factorization.

863891136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16179 (or 16163 counting only the distinct ones).

The product of its digits is 186624, while the sum is 45.

The square root of 863891136 is about 29392.0250408168. The cubic root of 863891136 is about 952.4006269942.

The spelling of 863891136 in words is "eight hundred sixty-three million, eight hundred ninety-one thousand, one hundred thirty-six".