648991582 has 4 divisors (see below), whose sum is σ = 973487376. Its totient is φ = 324495790.

The previous prime is 648991571. The next prime is 648991589. The reversal of 648991582 is 285199846.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (648991589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 162247894 + ... + 162247897.

It is an arithmetic number, because the mean of its divisors is an integer number (243371844).

Almost surely, 2^648991582 is an apocalyptic number.

648991582 is a deficient number, since it is larger than the sum of its proper divisors (324495794).

648991582 is a wasteful number, since it uses less digits than its factorization.

648991582 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 324495793.

The product of its digits is 1244160, while the sum is 52.

The square root of 648991582 is about 25475.3131874762. The cubic root of 648991582 is about 865.7909088119.

The spelling of 648991582 in words is "six hundred forty-eight million, nine hundred ninety-one thousand, five hundred eighty-two".