688888888888890 has 32 divisors (see below), whose sum is σ = 1655043088659840. Its totient is φ = 183513730889664.

The previous prime is 688888888888867. The next prime is 688888888889009. The reversal of 688888888888890 is 98888888888886.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11873271385 + ... + 11873329404.

It is an arithmetic number, because the mean of its divisors is an integer number (51720096520620).

Almost surely, 2^{688888888888890} is an apocalyptic number.

688888888888890 is an abundant number, since it is smaller than the sum of its proper divisors (966154199770950).

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

688888888888890 is a wasteful number, since it uses less digits than its factorization.

688888888888890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23746601766.

The product of its (nonzero) digits is 3710851743744, while the sum is 111.

The spelling of 688888888888890 in words is "six hundred eighty-eight trillion, eight hundred eighty-eight billion, eight hundred eighty-eight million, eight hundred eighty-eight thousand, eight hundred ninety".