688716587 has 16 divisors (see below), whose sum is σ = 754512192. Its totient is φ = 624844800.

The previous prime is 688716547. The next prime is 688716593. The reversal of 688716587 is 785617886.

It is a cyclic number.

It is not a de Polignac number, because 688716587 - 2²⁰ = 687668011 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (688716547) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 188603 + ... + 192219.

It is an arithmetic number, because the mean of its divisors is an integer number (47157012).

Almost surely, 2^688716587 is an apocalyptic number.

688716587 is a deficient number, since it is larger than the sum of its proper divisors (65795605).

688716587 is a wasteful number, since it uses less digits than its factorization.

688716587 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3878.

The product of its digits is 4515840, while the sum is 56.

The square root of 688716587 is about 26243.4103538393. The cubic root of 688716587 is about 883.1073801881.

The spelling of 688716587 in words is "six hundred eighty-eight million, seven hundred sixteen thousand, five hundred eighty-seven".