6688733540 has 12 divisors (see below), whose sum is σ = 14046340476. Its totient is φ = 2675493408.

The previous prime is 6688733531. The next prime is 6688733567. The reversal of 6688733540 is 453378866.

It can be written as a sum of positive squares in 2 ways, for example, as 1761816676 + 4926916864 = 41974^2 + 70192^2 .

It is a hoax number, since the sum of its digits (50) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 167218319 + ... + 167218358.

It is an arithmetic number, because the mean of its divisors is an integer number (1170528373).

Almost surely, 2^6688733540 is an apocalyptic number.

It is an amenable number.

6688733540 is an abundant number, since it is smaller than the sum of its proper divisors (7357606936).

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

6688733540 is a wasteful number, since it uses less digits than its factorization.

6688733540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 334436686 (or 334436684 counting only the distinct ones).

The product of its (nonzero) digits is 2903040, while the sum is 50.

The square root of 6688733540 is about 81784.6779048496. The cubic root of 6688733540 is about 1884.1463430783.

The spelling of 6688733540 in words is "six billion, six hundred eighty-eight million, seven hundred thirty-three thousand, five hundred forty".