623688 has 32 divisors (see below), whose sum is σ = 1680000. Its totient is φ = 191808.

The previous prime is 623683. The next prime is 623699. The reversal of 623688 is 886326.

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (623681) by changing a digit.

623688 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 7 ways as a sum of consecutive naturals, for example, 688 + ... + 1311.

It is an arithmetic number, because the mean of its divisors is an integer number (52500).

2⁶²³⁶⁸⁸ is an apocalyptic number.

It is an amenable number.

623688 is an abundant number, since it is smaller than the sum of its proper divisors (1056312).

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

623688 is a wasteful number, since it uses less digits than its factorization.

623688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2021 (or 2017 counting only the distinct ones).

The product of its digits is 13824, while the sum is 33.

The square root of 623688 is about 789.7391974570. The cubic root of 623688 is about 85.4389290640.

The spelling of 623688 in words is "six hundred twenty-three thousand, six hundred eighty-eight".