731988689 has 4 divisors (see below), whose sum is σ = 733342260. Its totient is φ = 730635120.

The previous prime is 731988667. The next prime is 731988721. The reversal of 731988689 is 986889137.

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 238393600 + 493595089 = 15440^2 + 22217^2 .

It is a cyclic number.

It is not a de Polignac number, because 731988689 - 2¹² = 731984593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (731988659) 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 3 ways as a sum of consecutive naturals, for example, 675974 + ... + 677055.

It is an arithmetic number, because the mean of its divisors is an integer number (183335565).

Almost surely, 2^731988689 is an apocalyptic number.

It is an amenable number.

731988689 is a deficient number, since it is larger than the sum of its proper divisors (1353571).

731988689 is a wasteful number, since it uses less digits than its factorization.

731988689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1353570.

The product of its digits is 5225472, while the sum is 59.

The square root of 731988689 is about 27055.2894828350. The cubic root of 731988689 is about 901.2282362238.

The spelling of 731988689 in words is "seven hundred thirty-one million, nine hundred eighty-eight thousand, six hundred eighty-nine".