731136 has 96 divisors (see below), whose sum is σ = 2358720. Its totient is φ = 196608.

The previous prime is 731117. The next prime is 731141. The reversal of 731136 is 631137.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

731136 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 (5) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43000 + ... + 43016.

It is an arithmetic number, because the mean of its divisors is an integer number (24570).

2⁷³¹¹³⁶ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 731136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1179360).

731136 is an abundant number, since it is smaller than the sum of its proper divisors (1627584).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

731136 is a wasteful number, since it uses less digits than its factorization.

731136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49 (or 29 counting only the distinct ones).

The product of its digits is 378, while the sum is 21.

The square root of 731136 is about 855.0649098168. The cubic root of 731136 is about 90.0878155226.

Subtracting from 731136 its reverse (631137), we obtain a palindrome (99999).

It can be divided in two parts, 73 and 1136, that multiplied together give a palindrome (82928).

The spelling of 731136 in words is "seven hundred thirty-one thousand, one hundred thirty-six".