648638332 has 24 divisors (see below), whose sum is σ = 1202829264. Its totient is φ = 305002752.

The previous prime is 648638303. The next prime is 648638363. The reversal of 648638332 is 233836846.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 108403 + ... + 114229.

It is an arithmetic number, because the mean of its divisors is an integer number (50117886).

Almost surely, 2^648638332 is an apocalyptic number.

It is an amenable number.

648638332 is a deficient number, since it is larger than the sum of its proper divisors (554190932).

648638332 is a wasteful number, since it uses less digits than its factorization.

648638332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7485 (or 7483 counting only the distinct ones).

The product of its digits is 497664, while the sum is 43.

The square root of 648638332 is about 25468.3790611024. The cubic root of 648638332 is about 865.6337952457.

The spelling of 648638332 in words is "six hundred forty-eight million, six hundred thirty-eight thousand, three hundred thirty-two".