867636 has 72 divisors (see below), whose sum is σ = 2743104. Its totient is φ = 224640.

The previous prime is 867631. The next prime is 867641. The reversal of 867636 is 636768.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (867631) and next prime (867641).

It is a Harshad number since it is a multiple of its sum of digits (36).

Its product of digits (36288) is a multiple of the sum of its prime divisors (336).

It is a self number, because there is not a number n which added to its sum of digits gives 867636.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (867631) by changing a digit.

867636 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2616 + ... + 2928.

2⁸⁶⁷⁶³⁶ 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 867636, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1371552).

867636 is an abundant number, since it is smaller than the sum of its proper divisors (1875468).

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

867636 is a wasteful number, since it uses less digits than its factorization.

867636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 341 (or 336 counting only the distinct ones).

The product of its digits is 36288, while the sum is 36.

The square root of 867636 is about 931.4698062739. The cubic root of 867636 is about 95.3774823904.

The spelling of 867636 in words is "eight hundred sixty-seven thousand, six hundred thirty-six".