688888890 has 48 divisors (see below), whose sum is σ = 1885384800. Its totient is φ = 174034656.

The previous prime is 688888883. The next prime is 688888891. The reversal of 688888890 is 98888886.

688888890 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (688888891) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 199720 + ... + 203139.

It is an arithmetic number, because the mean of its divisors is an integer number (39278850).

Almost surely, 2^688888890 is an apocalyptic number.

688888890 is an abundant number, since it is smaller than the sum of its proper divisors (1196495910).

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

688888890 is a wasteful number, since it uses less digits than its factorization.

688888890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 402891 (or 402888 counting only the distinct ones).

The product of its (nonzero) digits is 14155776, while the sum is 63.

The square root of 688888890 is about 26246.6929345394. The cubic root of 688888890 is about 883.1810192661.

The spelling of 688888890 in words is "six hundred eighty-eight million, eight hundred eighty-eight thousand, eight hundred ninety".