648861816 has 16 divisors (see below), whose sum is σ = 1622154600. Its totient is φ = 216287264.

The previous prime is 648861791. The next prime is 648861827. The reversal of 648861816 is 618168846.

648861816 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

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, 13517931 + ... + 13517978.

Almost surely, 2^648861816 is an apocalyptic number.

It is an amenable number.

648861816 is an abundant number, since it is smaller than the sum of its proper divisors (973292784).

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

648861816 is a wasteful number, since it uses less digits than its factorization.

648861816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27035918 (or 27035914 counting only the distinct ones).

The product of its digits is 442368, while the sum is 48.

The square root of 648861816 is about 25472.7661631005. The cubic root of 648861816 is about 865.7331999422.

The spelling of 648861816 in words is "six hundred forty-eight million, eight hundred sixty-one thousand, eight hundred sixteen".