688561315 has 16 divisors (see below), whose sum is σ = 896339808. Its totient is φ = 504758016.

The previous prime is 688561309. The next prime is 688561369. The reversal of 688561315 is 513165886.

It is a cyclic number.

It is not a de Polignac number, because 688561315 - 2⁷ = 688561187 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29757 + ... + 47566.

It is an arithmetic number, because the mean of its divisors is an integer number (56021238).

Almost surely, 2^688561315 is an apocalyptic number.

688561315 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

688561315 is a deficient number, since it is larger than the sum of its proper divisors (207778493).

688561315 is a wasteful number, since it uses less digits than its factorization.

688561315 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77478.

The product of its digits is 172800, while the sum is 43.

The square root of 688561315 is about 26240.4518825420. The cubic root of 688561315 is about 883.0410093191.

The spelling of 688561315 in words is "six hundred eighty-eight million, five hundred sixty-one thousand, three hundred fifteen".