688989103 has 4 divisors (see below), whose sum is σ = 751624488. Its totient is φ = 626353720.

The previous prime is 688989071. The next prime is 688989131. The reversal of 688989103 is 301989886.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 688989103 - 2⁵ = 688989071 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (688989703) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31317676 + ... + 31317697.

It is an arithmetic number, because the mean of its divisors is an integer number (187906122).

Almost surely, 2^688989103 is an apocalyptic number.

688989103 is a deficient number, since it is larger than the sum of its proper divisors (62635385).

688989103 is a wasteful number, since it uses less digits than its factorization.

688989103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62635384.

The product of its (nonzero) digits is 746496, while the sum is 52.

The square root of 688989103 is about 26248.6019246740. The cubic root of 688989103 is about 883.2238427797.

The spelling of 688989103 in words is "six hundred eighty-eight million, nine hundred eighty-nine thousand, one hundred three".