731776 has 16 divisors (see below), whose sum is σ = 1458090. Its totient is φ = 365824.

The previous prime is 731767. The next prime is 731779. The reversal of 731776 is 677137.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 602176 + 129600 = 776^2 + 360^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is a super-2 number, since 2×731776² = 1070992228352, which contains 22 as substring.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (731779) by changing a digit.

731776 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 (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2731 + ... + 2986.

2⁷³¹⁷⁷⁶ is an apocalyptic number.

It is an amenable number.

731776 is a deficient number, since it is larger than the sum of its proper divisors (726314).

731776 is an equidigital number, since it uses as much as digits as its factorization.

731776 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5731 (or 5719 counting only the distinct ones).

The product of its digits is 6174, while the sum is 31.

The square root of 731776 is about 855.4390685490. The cubic root of 731776 is about 90.1140939838.

It can be divided in two parts, 73 and 1776, that added together give a square (1849 = 43²).

The spelling of 731776 in words is "seven hundred thirty-one thousand, seven hundred seventy-six".