648836 has 6 divisors (see below), whose sum is σ = 1135470. Its totient is φ = 324416.

The previous prime is 648803. The next prime is 648841. The reversal of 648836 is 638846.

It can be written as a sum of positive squares in only one way, i.e., 640000 + 8836 = 800^2 + 94^2 .

It is a junction number, because it is equal to n+sod(n) for n = 648796 and 648805.

It is an unprimeable number.

648836 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 as a sum of consecutive naturals, namely, 81101 + ... + 81108.

It is an arithmetic number, because the mean of its divisors is an integer number (189245).

2⁶⁴⁸⁸³⁶ is an apocalyptic number.

It is an amenable number.

648836 is a deficient number, since it is larger than the sum of its proper divisors (486634).

648836 is a wasteful number, since it uses less digits than its factorization.

648836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162213 (or 162211 counting only the distinct ones).

The product of its digits is 27648, while the sum is 35.

The square root of 648836 is about 805.5035692038. The cubic root of 648836 is about 86.5721718265.

It can be divided in two parts, 64 and 8836, that multiplied together give a square (565504 = 752²).

The spelling of 648836 in words is "six hundred forty-eight thousand, eight hundred thirty-six".