731128738 has 16 divisors (see below), whose sum is σ = 1181293056. Its totient is φ = 338389920.

The previous prime is 731128733. The next prime is 731128771. The reversal of 731128738 is 837821137.

It is a self number, because there is not a number n which added to its sum of digits gives 731128738.

It is not an unprimeable number, because it can be changed into a prime (731128733) 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, 254931 + ... + 257782.

It is an arithmetic number, because the mean of its divisors is an integer number (73830816).

Almost surely, 2^731128738 is an apocalyptic number.

731128738 is a deficient number, since it is larger than the sum of its proper divisors (450164318).

731128738 is a wasteful number, since it uses less digits than its factorization.

731128738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 512769.

The product of its digits is 56448, while the sum is 40.

The square root of 731128738 is about 27039.3923378466. The cubic root of 731128738 is about 900.8751725624.

The spelling of 731128738 in words is "seven hundred thirty-one million, one hundred twenty-eight thousand, seven hundred thirty-eight".