688341587 has 4 divisors (see below), whose sum is σ = 690555216. Its totient is φ = 686127960.

The previous prime is 688341583. The next prime is 688341623. The reversal of 688341587 is 785143886.

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 688341587 - 2² = 688341583 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (688341583) 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, 1106348 + ... + 1106969.

It is an arithmetic number, because the mean of its divisors is an integer number (172638804).

Almost surely, 2^688341587 is an apocalyptic number.

688341587 is a deficient number, since it is larger than the sum of its proper divisors (2213629).

688341587 is a wasteful number, since it uses less digits than its factorization.

688341587 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2213628.

The product of its digits is 1290240, while the sum is 50.

The square root of 688341587 is about 26236.2647303308. The cubic root of 688341587 is about 882.9470697413.

The spelling of 688341587 in words is "six hundred eighty-eight million, three hundred forty-one thousand, five hundred eighty-seven".