688560738 has 16 divisors (see below), whose sum is σ = 1378090560. Its totient is φ = 229358736.

The previous prime is 688560727. The next prime is 688560749. The reversal of 688560738 is 837065886.

It is an interprime number because it is at equal distance from previous prime (688560727) and next prime (688560749).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30973 + ... + 48336.

It is an arithmetic number, because the mean of its divisors is an integer number (86130660).

Almost surely, 2^688560738 is an apocalyptic number.

688560738 is an abundant number, since it is smaller than the sum of its proper divisors (689529822).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

688560738 is a wasteful number, since it uses less digits than its factorization.

688560738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80761.

The product of its (nonzero) digits is 1935360, while the sum is 51.

The square root of 688560738 is about 26240.4408880644. The cubic root of 688560738 is about 883.0407626624.

The spelling of 688560738 in words is "six hundred eighty-eight million, five hundred sixty thousand, seven hundred thirty-eight".