636416 has 40 divisors (see below), whose sum is σ = 1399464. Its totient is φ = 286720.

The previous prime is 636409. The next prime is 636421. The reversal of 636416 is 614636.

It is a plaindrome in base 9.

It is a congruent number.

It is an unprimeable number.

636416 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 (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5576 + ... + 5688.

2⁶³⁶⁴¹⁶ 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 636416, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (699732).

636416 is an abundant number, since it is smaller than the sum of its proper divisors (763048).

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

636416 is a wasteful number, since it uses less digits than its factorization.

636416 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142 (or 126 counting only the distinct ones).

The product of its digits is 2592, while the sum is 26.

The square root of 636416 is about 797.7568551883. The cubic root of 636416 is about 86.0162219264.

The spelling of 636416 in words is "six hundred thirty-six thousand, four hundred sixteen".