648642005 has 16 divisors (see below), whose sum is σ = 872083584. Its totient is φ = 458988480.

The previous prime is 648641999. The next prime is 648642031. The reversal of 648642005 is 500246846.

It is not a de Polignac number, because 648642005 - 2⁴ = 648641989 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 15 ways as a sum of consecutive naturals, for example, 157337 + ... + 161406.

It is an arithmetic number, because the mean of its divisors is an integer number (54505224).

Almost surely, 2^648642005 is an apocalyptic number.

It is an amenable number.

648642005 is a deficient number, since it is larger than the sum of its proper divisors (223441579).

648642005 is a wasteful number, since it uses less digits than its factorization.

648642005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 318796.

The product of its (nonzero) digits is 46080, while the sum is 35.

The square root of 648642005 is about 25468.4511700260. The cubic root of 648642005 is about 865.6354291644.

The spelling of 648642005 in words is "six hundred forty-eight million, six hundred forty-two thousand, five".