636064 has 48 divisors (see below), whose sum is σ = 1481760. Its totient is φ = 264960.

The previous prime is 636061. The next prime is 636071. The reversal of 636064 is 460636.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (636061) 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, 4507 + ... + 4645.

It is an arithmetic number, because the mean of its divisors is an integer number (30870).

2⁶³⁶⁰⁶⁴ 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 636064, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (740880).

636064 is an abundant number, since it is smaller than the sum of its proper divisors (845696).

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

636064 is a wasteful number, since it uses less digits than its factorization.

636064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173 (or 165 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 25.

The square root of 636064 is about 797.5362060747. The cubic root of 636064 is about 86.0003605537. Note that the first 3 decimals are identical.

The spelling of 636064 in words is "six hundred thirty-six thousand, sixty-four".