688966 has 4 divisors (see below), whose sum is σ = 1033452. Its totient is φ = 344482.

The previous prime is 688957. The next prime is 688969. The reversal of 688966 is 669886.

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

It is a nialpdrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (688969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 172240 + ... + 172243.

It is an arithmetic number, because the mean of its divisors is an integer number (258363).

2⁶⁸⁸⁹⁶⁶ is an apocalyptic number.

688966 is a deficient number, since it is larger than the sum of its proper divisors (344486).

688966 is a wasteful number, since it uses less digits than its factorization.

688966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 344485.

The product of its digits is 124416, while the sum is 43.

The square root of 688966 is about 830.0397580839. The cubic root of 688966 is about 88.3213970660.

The spelling of 688966 in words is "six hundred eighty-eight thousand, nine hundred sixty-six".