123042728 has 16 divisors (see below), whose sum is σ = 231010080. Its totient is φ = 61440048.

The previous prime is 123042721. The next prime is 123042743. The reversal of 123042728 is 827240321.

It is a self number, because there is not a number n which added to its sum of digits gives 123042728.

It is not an unprimeable number, because it can be changed into a prime (123042721) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3476 + ... + 16067.

It is an arithmetic number, because the mean of its divisors is an integer number (14438130).

Almost surely, 2^123042728 is an apocalyptic number.

It is an amenable number.

123042728 is a deficient number, since it is larger than the sum of its proper divisors (107967352).

123042728 is a wasteful number, since it uses less digits than its factorization.

123042728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20336 (or 20332 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 29.

The square root of 123042728 is about 11092.4626661531. The cubic root of 123042728 is about 497.3765632332.

The spelling of 123042728 in words is "one hundred twenty-three million, forty-two thousand, seven hundred twenty-eight".