728284123 has 4 divisors (see below), whose sum is σ = 832324720. Its totient is φ = 624243528.

The previous prime is 728284099. The next prime is 728284157. The reversal of 728284123 is 321482827.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 728284123 - 2²¹ = 726186971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (728284423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52020288 + ... + 52020301.

It is an arithmetic number, because the mean of its divisors is an integer number (208081180).

Almost surely, 2^728284123 is an apocalyptic number.

728284123 is a deficient number, since it is larger than the sum of its proper divisors (104040597).

728284123 is a wasteful number, since it uses less digits than its factorization.

728284123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104040596.

The product of its digits is 43008, while the sum is 37.

The square root of 728284123 is about 26986.7397623351. The cubic root of 728284123 is about 899.7053039267.

The spelling of 728284123 in words is "seven hundred twenty-eight million, two hundred eighty-four thousand, one hundred twenty-three".