123643731320 has 32 divisors (see below), whose sum is σ = 278215700400. Its totient is φ = 49454416128.

The previous prime is 123643731313. The next prime is 123643731377. The reversal of 123643731320 is 23137346321.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 620996 + ... + 795564.

Almost surely, 2^123643731320 is an apocalyptic number.

123643731320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123643731320 is an abundant number, since it is smaller than the sum of its proper divisors (154571969080).

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

123643731320 is a wasteful number, since it uses less digits than its factorization.

123643731320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192287 (or 192283 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 35.

The spelling of 123643731320 in words is "one hundred twenty-three billion, six hundred forty-three million, seven hundred thirty-one thousand, three hundred twenty".