123123664 has 20 divisors (see below), whose sum is σ = 243054756. Its totient is φ = 60399872.

The previous prime is 123123643. The next prime is 123123677. The reversal of 123123664 is 466321321.

It can be written as a sum of positive squares in 2 ways, for example, as 60840000 + 62283664 = 7800^2 + 7892^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 71749 + ... + 73444.

Almost surely, 2^123123664 is an apocalyptic number.

It is an amenable number.

123123664 is a deficient number, since it is larger than the sum of its proper divisors (119931092).

123123664 is a wasteful number, since it uses less digits than its factorization.

123123664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145254 (or 145248 counting only the distinct ones).

The product of its digits is 5184, while the sum is 28.

The square root of 123123664 is about 11096.1103094733. The cubic root of 123123664 is about 497.4855954012.

Adding to 123123664 its reverse (466321321), we get a palindrome (589444985).

The spelling of 123123664 in words is "one hundred twenty-three million, one hundred twenty-three thousand, six hundred sixty-four".