635648 has 36 divisors (see below), whose sum is σ = 1373568. Its totient is φ = 291840.

The previous prime is 635639. The next prime is 635653. The reversal of 635648 is 846536.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is an unprimeable number.

635648 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, 3233 + ... + 3423.

2⁶³⁵⁶⁴⁸ 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 635648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (686784).

635648 is an abundant number, since it is smaller than the sum of its proper divisors (737920).

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

635648 is a wasteful number, since it uses less digits than its factorization.

635648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220 (or 206 counting only the distinct ones).

The product of its digits is 17280, while the sum is 32.

The square root of 635648 is about 797.2753602113. The cubic root of 635648 is about 85.9816077488.

The spelling of 635648 in words is "six hundred thirty-five thousand, six hundred forty-eight".