648784 has 40 divisors (see below), whose sum is σ = 1374912. Its totient is φ = 295680.

The previous prime is 648779. The next prime is 648803. The reversal of 648784 is 487846.

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15067 + ... + 15109.

2⁶⁴⁸⁷⁸⁴ 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 648784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (687456).

648784 is an abundant number, since it is smaller than the sum of its proper divisors (726128).

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

648784 is a wasteful number, since it uses less digits than its factorization.

648784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115 (or 109 counting only the distinct ones).

The product of its digits is 43008, while the sum is 37.

The square root of 648784 is about 805.4712906119. The cubic root of 648784 is about 86.5698590319.

The spelling of 648784 in words is "six hundred forty-eight thousand, seven hundred eighty-four".