648449983 has 4 divisors (see below), whose sum is σ = 648570928. Its totient is φ = 648329040.

The previous prime is 648449969. The next prime is 648449999. The reversal of 648449983 is 389944846.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 648449983 - 2¹³ = 648441791 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (648449903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52038 + ... + 63283.

It is an arithmetic number, because the mean of its divisors is an integer number (162142732).

Almost surely, 2^648449983 is an apocalyptic number.

648449983 is a deficient number, since it is larger than the sum of its proper divisors (120945).

648449983 is a wasteful number, since it uses less digits than its factorization.

648449983 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120944.

The product of its digits is 5971968, while the sum is 55.

The square root of 648449983 is about 25464.6810896975. The cubic root of 648449983 is about 865.5500007102.

The spelling of 648449983 in words is "six hundred forty-eight million, four hundred forty-nine thousand, nine hundred eighty-three".