731636 has 12 divisors (see below), whose sum is σ = 1286628. Its totient is φ = 364032.

The previous prime is 731623. The next prime is 731639. The reversal of 731636 is 636137.

It can be written as a sum of positive squares in 2 ways, for example, as 422500 + 309136 = 650^2 + 556^2 .

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 731636.

It is not an unprimeable number, because it can be changed into a prime (731639) by changing a digit.

731636 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 980 + ... + 1556.

It is an arithmetic number, because the mean of its divisors is an integer number (107219).

2⁷³¹⁶³⁶ is an apocalyptic number.

It is an amenable number.

731636 is a deficient number, since it is larger than the sum of its proper divisors (554992).

731636 is a wasteful number, since it uses less digits than its factorization.

731636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 898 (or 896 counting only the distinct ones).

The product of its digits is 2268, while the sum is 26.

The square root of 731636 is about 855.3572353117. The cubic root of 731636 is about 90.1083468801.

The spelling of 731636 in words is "seven hundred thirty-one thousand, six hundred thirty-six".