648636 has 24 divisors (see below), whose sum is σ = 1526784. Its totient is φ = 214320.

The previous prime is 648631. The next prime is 648649. The reversal of 648636 is 636846.

It is a junction number, because it is equal to n+sod(n) for n = 648597 and 648606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (648631) 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, 2151 + ... + 2433.

It is an arithmetic number, because the mean of its divisors is an integer number (63616).

2⁶⁴⁸⁶³⁶ is an apocalyptic number.

It is an amenable number.

648636 is an abundant number, since it is smaller than the sum of its proper divisors (878148).

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

648636 is a wasteful number, since it uses less digits than its factorization.

648636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 481 (or 479 counting only the distinct ones).

The product of its digits is 20736, while the sum is 33.

The square root of 648636 is about 805.3794136927. The cubic root of 648636 is about 86.5632757862.

The spelling of 648636 in words is "six hundred forty-eight thousand, six hundred thirty-six".