688444 has 12 divisors (see below), whose sum is σ = 1216600. Its totient is φ = 340848.

The previous prime is 688433. The next prime is 688447. The reversal of 688444 is 444886.

It is a super-2 number, since 2×688444² = 947910282272, which contains 22 as substring.

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (688447) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 354 + ... + 1225.

2⁶⁸⁸⁴⁴⁴ is an apocalyptic number.

It is an amenable number.

688444 is a deficient number, since it is larger than the sum of its proper divisors (528156).

688444 is a wasteful number, since it uses less digits than its factorization.

688444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1692 (or 1690 counting only the distinct ones).

The product of its digits is 24576, while the sum is 34.

The square root of 688444 is about 829.7252557323. The cubic root of 688444 is about 88.2990856516.

The spelling of 688444 in words is "six hundred eighty-eight thousand, four hundred forty-four".