648406928 has 40 divisors (see below), whose sum is σ = 1432517688. Its totient is φ = 281659392.

The previous prime is 648406921. The next prime is 648406931. The reversal of 648406928 is 829604846.

648406928 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 4 ways, for example, as 159466384 + 488940544 = 12628^2 + 22112^2 .

It is not an unprimeable number, because it can be changed into a prime (648406921) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 88151 + ... + 95222.

Almost surely, 2^648406928 is an apocalyptic number.

648406928 is a gapful number since it is divisible by the number (68) formed by its first and last digit.

It is an amenable number.

648406928 is an abundant number, since it is smaller than the sum of its proper divisors (784110760).

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

648406928 is a wasteful number, since it uses less digits than its factorization.

648406928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 183411 (or 183405 counting only the distinct ones).

The product of its (nonzero) digits is 663552, while the sum is 47.

The square root of 648406928 is about 25463.8356890709. The cubic root of 648406928 is about 865.5308437044.

The spelling of 648406928 in words is "six hundred forty-eight million, four hundred six thousand, nine hundred twenty-eight".