648028 has 6 divisors (see below), whose sum is σ = 1134056. Its totient is φ = 324012.

The previous prime is 648019. The next prime is 648029. The reversal of 648028 is 820846.

It is a junction number, because it is equal to n+sod(n) for n = 647987 and 648005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (648029) by changing a digit.

648028 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 (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81000 + ... + 81007.

2⁶⁴⁸⁰²⁸ is an apocalyptic number.

It is an amenable number.

648028 is a deficient number, since it is larger than the sum of its proper divisors (486028).

648028 is a wasteful number, since it uses less digits than its factorization.

648028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162011 (or 162009 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 28.

The square root of 648028 is about 805.0018633519. The cubic root of 648028 is about 86.5362205890.

The spelling of 648028 in words is "six hundred forty-eight thousand, twenty-eight".