688632487 has 4 divisors (see below), whose sum is σ = 704647240. Its totient is φ = 672617736.

The previous prime is 688632437. The next prime is 688632569. The reversal of 688632487 is 784236886.

688632487 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 784236886 = 2 ⋅392118443.

It is a cyclic number.

It is not a de Polignac number, because 688632487 - 2⁷ = 688632359 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (688632437) 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, 8007312 + ... + 8007397.

It is an arithmetic number, because the mean of its divisors is an integer number (176161810).

Almost surely, 2^688632487 is an apocalyptic number.

688632487 is a deficient number, since it is larger than the sum of its proper divisors (16014753).

688632487 is a wasteful number, since it uses less digits than its factorization.

688632487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16014752.

The product of its digits is 3096576, while the sum is 52.

The square root of 688632487 is about 26241.8079979258. The cubic root of 688632487 is about 883.0714329614.

The spelling of 688632487 in words is "six hundred eighty-eight million, six hundred thirty-two thousand, four hundred eighty-seven".