688789449 has 12 divisors (see below), whose sum is σ = 995896512. Its totient is φ = 458741400.

The previous prime is 688789429. The next prime is 688789457. The reversal of 688789449 is 944987886.

It is not a de Polignac number, because 688789449 - 2⁵ = 688789417 is a prime.

It is not an unprimeable number, because it can be changed into a prime (688789429) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 27837 + ... + 46394.

It is an arithmetic number, because the mean of its divisors is an integer number (82991376).

Almost surely, 2^688789449 is an apocalyptic number.

It is an amenable number.

688789449 is a deficient number, since it is larger than the sum of its proper divisors (307107063).

688789449 is a wasteful number, since it uses less digits than its factorization.

688789449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75268 (or 75265 counting only the distinct ones).

The product of its digits is 27869184, while the sum is 63.

The square root of 688789449 is about 26244.7985132292. The cubic root of 688789449 is about 883.1385215420.

The spelling of 688789449 in words is "six hundred eighty-eight million, seven hundred eighty-nine thousand, four hundred forty-nine".