648211738 has 8 divisors (see below), whose sum is σ = 981944820. Its totient is φ = 320896800.

The previous prime is 648211727. The next prime is 648211747. The reversal of 648211738 is 837112846.

648211738 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 2 ways, for example, as 643789129 + 4422609 = 25373^2 + 2103^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 648211738.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1604283 + ... + 1604686.

Almost surely, 2^648211738 is an apocalyptic number.

648211738 is a deficient number, since it is larger than the sum of its proper divisors (333733082).

648211738 is a wasteful number, since it uses less digits than its factorization.

648211738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3209072.

The product of its digits is 64512, while the sum is 40.

The square root of 648211738 is about 25460.0027101334. The cubic root of 648211738 is about 865.4439847104.

The spelling of 648211738 in words is "six hundred forty-eight million, two hundred eleven thousand, seven hundred thirty-eight".