688155340 has 12 divisors (see below), whose sum is σ = 1445126256. Its totient is φ = 275262128.

The previous prime is 688155313. The next prime is 688155343. The reversal of 688155340 is 43551886.

It is a junction number, because it is equal to n+sod(n) for n = 688155293 and 688155302.

It is not an unprimeable number, because it can be changed into a prime (688155343) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17203864 + ... + 17203903.

It is an arithmetic number, because the mean of its divisors is an integer number (120427188).

Almost surely, 2^688155340 is an apocalyptic number.

It is an amenable number.

688155340 is an abundant number, since it is smaller than the sum of its proper divisors (756970916).

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

688155340 is a wasteful number, since it uses less digits than its factorization.

688155340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34407776 (or 34407774 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 40.

The square root of 688155340 is about 26232.7150710711. The cubic root of 688155340 is about 882.8674285284.

The spelling of 688155340 in words is "six hundred eighty-eight million, one hundred fifty-five thousand, three hundred forty".