636671 has 8 divisors (see below), whose sum is σ = 766080. Its totient is φ = 516888.

The previous prime is 636653. The next prime is 636673. The reversal of 636671 is 176636.

636671 = T₄₂₃ + T₄₂₄ + ... + T₄₂₉.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-636671 is a prime.

It is a plaindrome in base 8.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (636673) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2261 + ... + 2526.

It is an arithmetic number, because the mean of its divisors is an integer number (95760).

2⁶³⁶⁶⁷¹ is an apocalyptic number.

636671 is a deficient number, since it is larger than the sum of its proper divisors (129409).

636671 is a wasteful number, since it uses less digits than its factorization.

636671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4813.

The product of its digits is 4536, while the sum is 29.

The square root of 636671 is about 797.9166623151. The cubic root of 636671 is about 86.0277087567.

The spelling of 636671 in words is "six hundred thirty-six thousand, six hundred seventy-one".