688315287 has 8 divisors (see below), whose sum is σ = 1001185920. Its totient is φ = 417160760.

The previous prime is 688315279. The next prime is 688315291. The reversal of 688315287 is 782513886.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 688315287 - 2³ = 688315279 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (688315207) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10428987 + ... + 10429052.

It is an arithmetic number, because the mean of its divisors is an integer number (125148240).

Almost surely, 2^688315287 is an apocalyptic number.

688315287 is a deficient number, since it is larger than the sum of its proper divisors (312870633).

688315287 is a wasteful number, since it uses less digits than its factorization.

688315287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20858053.

The product of its digits is 645120, while the sum is 48.

The square root of 688315287 is about 26235.7635109024. The cubic root of 688315287 is about 882.9358244507.

The spelling of 688315287 in words is "six hundred eighty-eight million, three hundred fifteen thousand, two hundred eighty-seven".