648118442 has 4 divisors (see below), whose sum is σ = 972177666. Its totient is φ = 324059220.

The previous prime is 648118433. The next prime is 648118463. The reversal of 648118442 is 244811846.

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., 452370361 + 195748081 = 21269^2 + 13991^2 .

It is a junction number, because it is equal to n+sod(n) for n = 648118396 and 648118405.

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 as a sum of consecutive naturals, namely, 162029609 + ... + 162029612.

Almost surely, 2^648118442 is an apocalyptic number.

648118442 is a deficient number, since it is larger than the sum of its proper divisors (324059224).

648118442 is a wasteful number, since it uses less digits than its factorization.

648118442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 324059223.

The product of its digits is 49152, while the sum is 38.

The square root of 648118442 is about 25458.1704370129. The cubic root of 648118442 is about 865.4024620971.

It can be divided in two parts, 64811844 and 2, that added together give a palindrome (64811846).

The spelling of 648118442 in words is "six hundred forty-eight million, one hundred eighteen thousand, four hundred forty-two".