728409122 has 16 divisors (see below), whose sum is σ = 1252112640. Its totient is φ = 311322528.

The previous prime is 728409107. The next prime is 728409127. The reversal of 728409122 is 221904827.

It is not an unprimeable number, because it can be changed into a prime (728409127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 65747 + ... + 76022.

It is an arithmetic number, because the mean of its divisors is an integer number (78257040).

Almost surely, 2^728409122 is an apocalyptic number.

728409122 is a deficient number, since it is larger than the sum of its proper divisors (523703518).

728409122 is a wasteful number, since it uses less digits than its factorization.

728409122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142145.

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 728409122 is about 26989.0555966673. The cubic root of 728409122 is about 899.7567746034.

The spelling of 728409122 in words is "seven hundred twenty-eight million, four hundred nine thousand, one hundred twenty-two".