630656 has 32 divisors (see below), whose sum is σ = 1356600. Its totient is φ = 290304.

The previous prime is 630613. The next prime is 630659. The reversal of 630656 is 656036.

It is a tau number, because it is divible by the number of its divisors (32).

It is a Harshad number since it is a multiple of its sum of digits (26).

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (630659) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1475 + ... + 1853.

2⁶³⁰⁶⁵⁶ 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 630656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (678300).

630656 is an abundant number, since it is smaller than the sum of its proper divisors (725944).

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

630656 is a wasteful number, since it uses less digits than its factorization.

630656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 406 (or 394 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 26.

The square root of 630656 is about 794.1385269586. The cubic root of 630656 is about 85.7559331999.

The spelling of 630656 in words is "six hundred thirty thousand, six hundred fifty-six".