123728140660 has 96 divisors (see below), whose sum is σ = 272697207552. Its totient is φ = 47111500800.

The previous prime is 123728140651. The next prime is 123728140663. The reversal of 123728140660 is 66041827321.

It is a super-3 number, since 3×123728140660³ (a number of 34 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123728140663) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6873592 + ... + 6891568.

It is an arithmetic number, because the mean of its divisors is an integer number (2840595912).

Almost surely, 2^123728140660 is an apocalyptic number.

123728140660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 123728140660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (136348603776).

123728140660 is an abundant number, since it is smaller than the sum of its proper divisors (148969066892).

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

123728140660 is a wasteful number, since it uses less digits than its factorization.

123728140660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18233 (or 18231 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 40.

Adding to 123728140660 its reverse (66041827321), we get a palindrome (189769967981).

The spelling of 123728140660 in words is "one hundred twenty-three billion, seven hundred twenty-eight million, one hundred forty thousand, six hundred sixty".