648418 has 4 divisors (see below), whose sum is σ = 972630. Its totient is φ = 324208.

The previous prime is 648391. The next prime is 648433. The reversal of 648418 is 814846.

648418 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.

It can be written as a sum of positive squares in only one way, i.e., 439569 + 208849 = 663^2 + 457^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 648418.

It is an unprimeable number.

648418 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, 162103 + ... + 162106.

2⁶⁴⁸⁴¹⁸ is an apocalyptic number.

648418 is a deficient number, since it is larger than the sum of its proper divisors (324212).

648418 is a wasteful number, since it uses less digits than its factorization.

648418 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 324211.

The product of its digits is 6144, while the sum is 31.

The square root of 648418 is about 805.2440623811. The cubic root of 648418 is about 86.5535770190.

The spelling of 648418 in words is "six hundred forty-eight thousand, four hundred eighteen".