728131973 has 4 divisors (see below), whose sum is σ = 730292940. Its totient is φ = 725971008.

The previous prime is 728131969. The next prime is 728131979. The reversal of 728131973 is 379131827.

728131973 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 363207364 + 364924609 = 19058^2 + 19103^2 .

It is a cyclic number.

It is not a de Polignac number, because 728131973 - 2² = 728131969 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 728131973.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (728131979) 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, 1079978 + ... + 1080651.

It is an arithmetic number, because the mean of its divisors is an integer number (182573235).

Almost surely, 2^728131973 is an apocalyptic number.

It is an amenable number.

728131973 is a deficient number, since it is larger than the sum of its proper divisors (2160967).

728131973 is a wasteful number, since it uses less digits than its factorization.

728131973 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2160966.

The product of its digits is 63504, while the sum is 41.

The square root of 728131973 is about 26983.9206380392. The cubic root of 728131973 is about 899.6426453701.

The spelling of 728131973 in words is "seven hundred twenty-eight million, one hundred thirty-one thousand, nine hundred seventy-three".