688883647 has 4 divisors (see below), whose sum is σ = 692689816. Its totient is φ = 685077480.

The previous prime is 688883641. The next prime is 688883659. The reversal of 688883647 is 746388886.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-688883647 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 688883591 and 688883600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (688883641) 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, 1902813 + ... + 1903174.

It is an arithmetic number, because the mean of its divisors is an integer number (173172454).

Almost surely, 2^688883647 is an apocalyptic number.

688883647 is a deficient number, since it is larger than the sum of its proper divisors (3806169).

688883647 is a wasteful number, since it uses less digits than its factorization.

688883647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3806168.

The product of its digits is 12386304, while the sum is 58.

The square root of 688883647 is about 26246.5930550996. The cubic root of 688883647 is about 883.1787786872.

The spelling of 688883647 in words is "six hundred eighty-eight million, eight hundred eighty-three thousand, six hundred forty-seven".