688516434 has 24 divisors (see below), whose sum is σ = 1543227660. Its totient is φ = 221591328.

The previous prime is 688516427. The next prime is 688516453. The reversal of 688516434 is 434615886.

It can be written as a sum of positive squares in 2 ways, for example, as 686702025 + 1814409 = 26205^2 + 1347^2 .

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 688516434.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 658977 + ... + 660020.

Almost surely, 2^688516434 is an apocalyptic number.

688516434 is an abundant number, since it is smaller than the sum of its proper divisors (854711226).

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

688516434 is a wasteful number, since it uses less digits than its factorization.

688516434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1319034 (or 1319031 counting only the distinct ones).

The product of its digits is 552960, while the sum is 45.

The square root of 688516434 is about 26239.5966813516. The cubic root of 688516434 is about 883.0218231194.

The spelling of 688516434 in words is "six hundred eighty-eight million, five hundred sixteen thousand, four hundred thirty-four".