688372 has 6 divisors (see below), whose sum is σ = 1204658. Its totient is φ = 344184.

The previous prime is 688357. The next prime is 688379. The reversal of 688372 is 273886.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 633616 + 54756 = 796^2 + 234^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (688379) by changing a digit.

688372 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86043 + ... + 86050.

2⁶⁸⁸³⁷² is an apocalyptic number.

It is an amenable number.

688372 is a deficient number, since it is larger than the sum of its proper divisors (516286).

688372 is a wasteful number, since it uses less digits than its factorization.

688372 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172097 (or 172095 counting only the distinct ones).

The product of its digits is 16128, while the sum is 34.

The square root of 688372 is about 829.6818667417. The cubic root of 688372 is about 88.2960073302.

The spelling of 688372 in words is "six hundred eighty-eight thousand, three hundred seventy-two".