123664646 has 16 divisors (see below), whose sum is σ = 216927744. Its totient is φ = 51766344.

The previous prime is 123664643. The next prime is 123664691. The reversal of 123664646 is 646466321.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123664643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 102110 + ... + 103313.

It is an arithmetic number, because the mean of its divisors is an integer number (13557984).

Almost surely, 2^123664646 is an apocalyptic number.

123664646 is a deficient number, since it is larger than the sum of its proper divisors (93263098).

123664646 is a wasteful number, since it uses less digits than its factorization.

123664646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205475.

The product of its digits is 124416, while the sum is 38.

The square root of 123664646 is about 11120.4606918958. The cubic root of 123664646 is about 498.2131499405.

The spelling of 123664646 in words is "one hundred twenty-three million, six hundred sixty-four thousand, six hundred forty-six".