688963638 has 16 divisors (see below), whose sum is σ = 1503193536. Its totient is φ = 208776840.

The previous prime is 688963619. The next prime is 688963651. The reversal of 688963638 is 836369886.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5219356 + ... + 5219487.

It is an arithmetic number, because the mean of its divisors is an integer number (93949596).

Almost surely, 2^688963638 is an apocalyptic number.

688963638 is an abundant number, since it is smaller than the sum of its proper divisors (814229898).

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

688963638 is a wasteful number, since it uses less digits than its factorization.

688963638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10438859.

The product of its digits is 8957952, while the sum is 57.

The square root of 688963638 is about 26248.1168467378. The cubic root of 688963638 is about 883.2129613438.

The spelling of 688963638 in words is "six hundred eighty-eight million, nine hundred sixty-three thousand, six hundred thirty-eight".