688130741 has 4 divisors (see below), whose sum is σ = 688230252. Its totient is φ = 688031232.

The previous prime is 688130711. The next prime is 688130749. The reversal of 688130741 is 147031886.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 280696516 + 407434225 = 16754^2 + 20185^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-688130741 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 688130695 and 688130704.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (688130749) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38540 + ... + 53493.

It is an arithmetic number, because the mean of its divisors is an integer number (172057563).

Almost surely, 2^688130741 is an apocalyptic number.

It is an amenable number.

688130741 is a deficient number, since it is larger than the sum of its proper divisors (99511).

688130741 is an equidigital number, since it uses as much as digits as its factorization.

688130741 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99510.

The product of its (nonzero) digits is 32256, while the sum is 38.

The square root of 688130741 is about 26232.2462057674. The cubic root of 688130741 is about 882.8569086582.

The spelling of 688130741 in words is "six hundred eighty-eight million, one hundred thirty thousand, seven hundred forty-one".