688646983 has 4 divisors (see below), whose sum is σ = 690997608. Its totient is φ = 686296360.

The previous prime is 688646977. The next prime is 688647013. The reversal of 688646983 is 389646886.

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 688646983 - 2⁵ = 688646951 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 (688646953) 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, 1174873 + ... + 1175458.

It is an arithmetic number, because the mean of its divisors is an integer number (172749402).

Almost surely, 2^688646983 is an apocalyptic number.

688646983 is a deficient number, since it is larger than the sum of its proper divisors (2350625).

688646983 is a wasteful number, since it uses less digits than its factorization.

688646983 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2350624.

The product of its digits is 11943936, while the sum is 58.

The square root of 688646983 is about 26242.0841969536. The cubic root of 688646983 is about 883.0776292581.

The spelling of 688646983 in words is "six hundred eighty-eight million, six hundred forty-six thousand, nine hundred eighty-three".