1648440005 has 4 divisors (see below), whose sum is σ = 1978128012. Its totient is φ = 1318752000.

The previous prime is 1648439983. The next prime is 1648440041. The reversal of 1648440005 is 5000448461.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 636754756 + 1011685249 = 25234^2 + 31807^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1648440005 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 164843996 + ... + 164844005.

It is an arithmetic number, because the mean of its divisors is an integer number (494532003).

Almost surely, 2^1648440005 is an apocalyptic number.

It is an amenable number.

1648440005 is a deficient number, since it is larger than the sum of its proper divisors (329688007).

1648440005 is an equidigital number, since it uses as much as digits as its factorization.

1648440005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 329688006.

The product of its (nonzero) digits is 15360, while the sum is 32.

The square root of 1648440005 is about 40600.9852712961. The cubic root of 1648440005 is about 1181.2932304849.

Adding to 1648440005 its reverse (5000448461), we get a palindrome (6648888466).

The spelling of 1648440005 in words is "one billion, six hundred forty-eight million, four hundred forty thousand, five".