731687 has 6 divisors (see below), whose sum is σ = 804384. Its totient is φ = 665060.

The previous prime is 731683. The next prime is 731711. The reversal of 731687 is 786137.

Added to its reverse (786137) it gives a square (1517824 = 1232²).

It is a happy number.

731687 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 731687 - 2² = 731683 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 731687.

It is not an unprimeable number, because it can be changed into a prime (731681) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2903 + ... + 3144.

It is an arithmetic number, because the mean of its divisors is an integer number (134064).

2⁷³¹⁶⁸⁷ is an apocalyptic number.

731687 is a deficient number, since it is larger than the sum of its proper divisors (72697).

731687 is a wasteful number, since it uses less digits than its factorization.

731687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6069 (or 6058 counting only the distinct ones).

The product of its digits is 7056, while the sum is 32.

The square root of 731687 is about 855.3870468975. The cubic root of 731687 is about 90.1104405527.

Adding to 731687 its reverse (786137), we get a square (1517824 = 1232²).

The spelling of 731687 in words is "seven hundred thirty-one thousand, six hundred eighty-seven".