648684 has 36 divisors (see below), whose sum is σ = 1687504. Its totient is φ = 209952.

The previous prime is 648677. The next prime is 648689. The reversal of 648684 is 486846.

648684 is a `hidden beast` number, since 648 + 6 + 8 + 4 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 648684.

It is not an unprimeable number, because it can be changed into a prime (648689) by changing a digit.

648684 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1089 + ... + 1575.

2⁶⁴⁸⁶⁸⁴ 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 648684, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (843752).

648684 is an abundant number, since it is smaller than the sum of its proper divisors (1038820).

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

648684 is a wasteful number, since it uses less digits than its factorization.

648684 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 534 (or 529 counting only the distinct ones).

The product of its digits is 36864, while the sum is 36.

The square root of 648684 is about 805.4092127608. The cubic root of 648684 is about 86.5654110026.

The spelling of 648684 in words is "six hundred forty-eight thousand, six hundred eighty-four".