636726 has 8 divisors (see below), whose sum is σ = 1273464. Its totient is φ = 212240.

The previous prime is 636721. The next prime is 636731. The reversal of 636726 is 627636.

It is an interprime number because it is at equal distance from previous prime (636721) and next prime (636731).

It is a sphenic number, since it is the product of 3 distinct primes.

636726 is an admirable number.

It is an Ulam number.

It is a plaindrome in base 8.

It is a junction number, because it is equal to n+sod(n) for n = 636693 and 636702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (636721) by changing a digit.

636726 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53055 + ... + 53066.

It is an arithmetic number, because the mean of its divisors is an integer number (159183).

2⁶³⁶⁷²⁶ is an apocalyptic number.

636726 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

636726 is a wasteful number, since it uses less digits than its factorization.

636726 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106126.

The product of its digits is 9072, while the sum is 30.

The square root of 636726 is about 797.9511263229. The cubic root of 636726 is about 86.0301859062.

Adding to 636726 its sum of digits (30), we get a triangular number (636756 = T₁₁₂₈).

The spelling of 636726 in words is "six hundred thirty-six thousand, seven hundred twenty-six".