648818 has 8 divisors (see below), whose sum is σ = 976860. Its totient is φ = 323200.

The previous prime is 648803. The next prime is 648841. The reversal of 648818 is 818846.

648818 = 227² + 228² + ... + 238².

It can be written as a sum of positive squares in 2 ways, for example, as 466489 + 182329 = 683^2 + 427^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable 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 in 3 ways as a sum of consecutive naturals, for example, 398 + ... + 1206.

2⁶⁴⁸⁸¹⁸ is an apocalyptic number.

648818 is a deficient number, since it is larger than the sum of its proper divisors (328042).

648818 is a wasteful number, since it uses less digits than its factorization.

648818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1212.

The product of its digits is 12288, while the sum is 35.

The square root of 648818 is about 805.4923959914. The cubic root of 648818 is about 86.5713712578.

The spelling of 648818 in words is "six hundred forty-eight thousand, eight hundred eighteen".