123666688 has 36 divisors (see below), whose sum is σ = 254829568. Its totient is φ = 59834880.

The previous prime is 123666677. The next prime is 123666689. The reversal of 123666688 is 886666321.

It is a plaindrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (123666689) 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, 145 + ... + 15727.

Almost surely, 2^123666688 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 123666688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (127414784).

123666688 is an abundant number, since it is smaller than the sum of its proper divisors (131162880).

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

123666688 is an equidigital number, since it uses as much as digits as its factorization.

123666688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15630 (or 15616 counting only the distinct ones).

The product of its digits is 497664, while the sum is 46.

The square root of 123666688 is about 11120.5525042598. The cubic root of 123666688 is about 498.2158921569.

The spelling of 123666688 in words is "one hundred twenty-three million, six hundred sixty-six thousand, six hundred eighty-eight".