723688 has 16 divisors (see below), whose sum is σ = 1550880. Its totient is φ = 310128.

The previous prime is 723661. The next prime is 723721. The reversal of 723688 is 886327.

It is a happy number.

It is an unprimeable number.

723688 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 in 3 ways as a sum of consecutive naturals, for example, 6406 + ... + 6517.

It is an arithmetic number, because the mean of its divisors is an integer number (96930).

2⁷²³⁶⁸⁸ is an apocalyptic number.

It is an amenable number.

723688 is an abundant number, since it is smaller than the sum of its proper divisors (827192).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

723688 is a wasteful number, since it uses less digits than its factorization.

723688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12936 (or 12932 counting only the distinct ones).

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

The square root of 723688 is about 850.6985364981. The cubic root of 723688 is about 89.7808660579.

The spelling of 723688 in words is "seven hundred twenty-three thousand, six hundred eighty-eight".