756721172 has 12 divisors (see below), whose sum is σ = 1324653876. Its totient is φ = 378248640.

The previous prime is 756721169. The next prime is 756721177. The reversal of 756721172 is 271127657.

It can be written as a sum of positive squares in 2 ways, for example, as 14485636 + 742235536 = 3806^2 + 27244^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (756721177) 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, 11729 + ... + 40632.

It is an arithmetic number, because the mean of its divisors is an integer number (110387823).

Almost surely, 2^756721172 is an apocalyptic number.

It is an amenable number.

756721172 is a deficient number, since it is larger than the sum of its proper divisors (567932704).

756721172 is a wasteful number, since it uses less digits than its factorization.

756721172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55978 (or 55976 counting only the distinct ones).

The product of its digits is 41160, while the sum is 38.

The square root of 756721172 is about 27508.5654296984. The cubic root of 756721172 is about 911.2662692045.

The spelling of 756721172 in words is "seven hundred fifty-six million, seven hundred twenty-one thousand, one hundred seventy-two".