123666864 has 20 divisors (see below), whose sum is σ = 319472856. Its totient is φ = 41222272.

The previous prime is 123666863. The next prime is 123666899. The reversal of 123666864 is 468666321.

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 (123666863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1288149 + ... + 1288244.

Almost surely, 2^123666864 is an apocalyptic number.

It is an amenable number.

123666864 is an abundant number, since it is smaller than the sum of its proper divisors (195805992).

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

123666864 is a wasteful number, since it uses less digits than its factorization.

123666864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2576404 (or 2576398 counting only the distinct ones).

The product of its digits is 248832, while the sum is 42.

The square root of 123666864 is about 11120.5604175329. The cubic root of 123666864 is about 498.2161285072.

The spelling of 123666864 in words is "one hundred twenty-three million, six hundred sixty-six thousand, eight hundred sixty-four".