688989674 has 4 divisors (see below), whose sum is σ = 1033484514. Its totient is φ = 344494836.

The previous prime is 688989671. The next prime is 688989683. The reversal of 688989674 is 476989886.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 426711649 + 262278025 = 20657^2 + 16195^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 688989674.

It is not an unprimeable number, because it can be changed into a prime (688989671) by changing a digit.

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 as a sum of consecutive naturals, namely, 172247417 + ... + 172247420.

Almost surely, 2^688989674 is an apocalyptic number.

688989674 is a deficient number, since it is larger than the sum of its proper divisors (344494840).

688989674 is a wasteful number, since it uses less digits than its factorization.

688989674 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 344494839.

The product of its digits is 41803776, while the sum is 65.

The square root of 688989674 is about 26248.6128014415. The cubic root of 688989674 is about 883.2240867703.

The spelling of 688989674 in words is "six hundred eighty-eight million, nine hundred eighty-nine thousand, six hundred seventy-four".