648838 has 4 divisors (see below), whose sum is σ = 973260. Its totient is φ = 324418.

The previous prime is 648803. The next prime is 648841. The reversal of 648838 is 838846.

648838 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 838846 = 2 ⋅419423.

It is a junction number, because it is equal to n+sod(n) for n = 648797 and 648806.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 162208 + ... + 162211.

It is an arithmetic number, because the mean of its divisors is an integer number (243315).

2⁶⁴⁸⁸³⁸ is an apocalyptic number.

648838 is a deficient number, since it is larger than the sum of its proper divisors (324422).

648838 is a wasteful number, since it uses less digits than its factorization.

648838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 324421.

The product of its digits is 36864, while the sum is 37.

The square root of 648838 is about 805.5048106622. The cubic root of 648838 is about 86.5722607777.

The spelling of 648838 in words is "six hundred forty-eight thousand, eight hundred thirty-eight".