123031728 has 30 divisors (see below), whose sum is σ = 344318364. Its totient is φ = 41010528.

The previous prime is 123031721. The next prime is 123031747. The reversal of 123031728 is 827130321.

It is not an unprimeable number, because it can be changed into a prime (123031721) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 427050 + ... + 427337.

Almost surely, 2^123031728 is an apocalyptic number.

123031728 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

123031728 is an abundant number, since it is smaller than the sum of its proper divisors (221286636).

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

123031728 is a wasteful number, since it uses less digits than its factorization.

123031728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 854401 (or 854392 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 123031728 is about 11091.9668228858. The cubic root of 123031728 is about 497.3617409967.

The spelling of 123031728 in words is "one hundred twenty-three million, thirty-one thousand, seven hundred twenty-eight".