648781632 has 42 divisors (see below), whose sum is σ = 1859617058. Its totient is φ = 216260352.

The previous prime is 648781621. The next prime is 648781669. The reversal of 648781632 is 236187846.

648781632 is a `hidden beast` number, since 6 + 4 + 8 + 7 + 8 + 1 + 632 = 666.

648781632 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 381655296 + 267126336 = 19536^2 + 16344^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 562603 + ... + 563754.

Almost surely, 2^648781632 is an apocalyptic number.

It is an amenable number.

648781632 is an abundant number, since it is smaller than the sum of its proper divisors (1210835426).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

648781632 is a wasteful number, since it uses less digits than its factorization.

648781632 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1126375 (or 1126362 counting only the distinct ones).

The product of its digits is 387072, while the sum is 45.

The square root of 648781632 is about 25471.1921982462. The cubic root of 648781632 is about 865.6975370789.

The spelling of 648781632 in words is "six hundred forty-eight million, seven hundred eighty-one thousand, six hundred thirty-two".