123011728 has 120 divisors (see below), whose sum is σ = 306730368. Its totient is φ = 46565376.

The previous prime is 123011683. The next prime is 123011761. The reversal of 123011728 is 827110321.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2320950 + ... + 2321002.

Almost surely, 2^123011728 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 123011728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (153365184).

123011728 is an abundant number, since it is smaller than the sum of its proper divisors (183718640).

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

123011728 is a wasteful number, since it uses less digits than its factorization.

123011728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161 (or 102 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 25.

The square root of 123011728 is about 11091.0652328800. The cubic root of 123011728 is about 497.3347892121.

The spelling of 123011728 in words is "one hundred twenty-three million, eleven thousand, seven hundred twenty-eight".