688131463 has 4 divisors (see below), whose sum is σ = 688203360. Its totient is φ = 688059568.

The previous prime is 688131419. The next prime is 688131469. The reversal of 688131463 is 364131886.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-688131463 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (688131469) 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, 18895 + ... + 41632.

It is an arithmetic number, because the mean of its divisors is an integer number (172050840).

Almost surely, 2^688131463 is an apocalyptic number.

688131463 is a deficient number, since it is larger than the sum of its proper divisors (71897).

688131463 is a wasteful number, since it uses less digits than its factorization.

688131463 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71896.

The product of its digits is 82944, while the sum is 40.

The square root of 688131463 is about 26232.2599674523. The cubic root of 688131463 is about 882.8572174282.

The spelling of 688131463 in words is "six hundred eighty-eight million, one hundred thirty-one thousand, four hundred sixty-three".