728866122 has 16 divisors (see below), whose sum is σ = 1458263520. Its totient is φ = 242866832.

The previous prime is 728866121. The next prime is 728866129. The reversal of 728866122 is 221668827.

It is a happy number.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (728866121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3033 + ... + 38300.

It is an arithmetic number, because the mean of its divisors is an integer number (91141470).

Almost surely, 2^728866122 is an apocalyptic number.

728866122 is an abundant number, since it is smaller than the sum of its proper divisors (729397398).

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

728866122 is a wasteful number, since it uses less digits than its factorization.

728866122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44277.

The product of its digits is 129024, while the sum is 42.

The square root of 728866122 is about 26997.5206639425. The cubic root of 728866122 is about 899.9449027999.

The spelling of 728866122 in words is "seven hundred twenty-eight million, eight hundred sixty-six thousand, one hundred twenty-two".