688805125 has 16 divisors (see below), whose sum is σ = 880601904. Its totient is φ = 537600000.

The previous prime is 688805111. The next prime is 688805137. The reversal of 688805125 is 521508886.

It can be written as a sum of positive squares in 8 ways, for example, as 381889764 + 306915361 = 19542^2 + 17519^2 .

It is not a de Polignac number, because 688805125 - 2¹¹ = 688803077 is a prime.

It is a super-3 number, since 3×688805125³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 62076 + ... + 72325.

It is an arithmetic number, because the mean of its divisors is an integer number (55037619).

Almost surely, 2^688805125 is an apocalyptic number.

It is an amenable number.

688805125 is a deficient number, since it is larger than the sum of its proper divisors (191796779).

688805125 is a wasteful number, since it uses less digits than its factorization.

688805125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134457 (or 134447 counting only the distinct ones).

The product of its (nonzero) digits is 153600, while the sum is 43.

The square root of 688805125 is about 26245.0971611842. The cubic root of 688805125 is about 883.1452212064.

The spelling of 688805125 in words is "six hundred eighty-eight million, eight hundred five thousand, one hundred twenty-five".