648928 has 24 divisors (see below), whose sum is σ = 1460592. Its totient is φ = 278016.

The previous prime is 648917. The next prime is 648931. The reversal of 648928 is 829846.

648928 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×648928² = 842215098368, which contains 22 as substring.

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

648928 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 3 ways as a sum of consecutive naturals, for example, 1225 + ... + 1672.

It is an arithmetic number, because the mean of its divisors is an integer number (60858).

2⁶⁴⁸⁹²⁸ is an apocalyptic number.

It is an amenable number.

648928 is an abundant number, since it is smaller than the sum of its proper divisors (811664).

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

648928 is a wasteful number, since it uses less digits than its factorization.

648928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2914 (or 2906 counting only the distinct ones).

The product of its digits is 27648, while the sum is 37.

The square root of 648928 is about 805.5606743132. The cubic root of 648928 is about 86.5762633912.

The spelling of 648928 in words is "six hundred forty-eight thousand, nine hundred twenty-eight".