688712927 has 4 divisors (see below), whose sum is σ = 787100496. Its totient is φ = 590325360.

The previous prime is 688712923. The next prime is 688712929. The reversal of 688712927 is 729217886.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 729217886 = 2 ⋅364608943.

It is a cyclic number.

It is not a de Polignac number, because 688712927 - 2² = 688712923 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (688712923) 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, 49193774 + ... + 49193787.

It is an arithmetic number, because the mean of its divisors is an integer number (196775124).

Almost surely, 2^688712927 is an apocalyptic number.

688712927 is a deficient number, since it is larger than the sum of its proper divisors (98387569).

688712927 is an equidigital number, since it uses as much as digits as its factorization.

688712927 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98387568.

The product of its digits is 677376, while the sum is 50.

The square root of 688712927 is about 26243.3406219559. The cubic root of 688712927 is about 883.1058158394.

The spelling of 688712927 in words is "six hundred eighty-eight million, seven hundred twelve thousand, nine hundred twenty-seven".