688835816 has 8 divisors (see below), whose sum is σ = 1291567170. Its totient is φ = 344417904.

The previous prime is 688835803. The next prime is 688835831. The reversal of 688835816 is 618538886.

It can be written as a sum of positive squares in only one way, i.e., 610584100 + 78251716 = 24710^2 + 8846^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43052231 + ... + 43052246.

Almost surely, 2^688835816 is an apocalyptic number.

It is an amenable number.

688835816 is a deficient number, since it is larger than the sum of its proper divisors (602731354).

688835816 is a wasteful number, since it uses less digits than its factorization.

688835816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86104483 (or 86104479 counting only the distinct ones).

The product of its digits is 2211840, while the sum is 53.

The square root of 688835816 is about 26245.6818543546. The cubic root of 688835816 is about 883.1583377404.

The spelling of 688835816 in words is "six hundred eighty-eight million, eight hundred thirty-five thousand, eight hundred sixteen".