688975487 has 4 divisors (see below), whose sum is σ = 689071320. Its totient is φ = 688879656.

The previous prime is 688975477. The next prime is 688975489. The reversal of 688975487 is 784579886.

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

It is a cyclic number.

It is not a de Polignac number, because 688975487 - 2⁴ = 688975471 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 (688975489) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36173 + ... + 51830.

It is an arithmetic number, because the mean of its divisors is an integer number (172267830).

Almost surely, 2^688975487 is an apocalyptic number.

688975487 is a deficient number, since it is larger than the sum of its proper divisors (95833).

688975487 is an equidigital number, since it uses as much as digits as its factorization.

688975487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95832.

The product of its digits is 27095040, while the sum is 62.

The square root of 688975487 is about 26248.3425571978. The cubic root of 688975487 is about 883.2180245671.

The spelling of 688975487 in words is "six hundred eighty-eight million, nine hundred seventy-five thousand, four hundred eighty-seven".