756721055 has 8 divisors (see below), whose sum is σ = 916396800. Its totient is φ = 599822496.

The previous prime is 756721033. The next prime is 756721057. The reversal of 756721055 is 550127657.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-756721055 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (756721057) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 693695 + ... + 694784.

It is an arithmetic number, because the mean of its divisors is an integer number (114549600).

Almost surely, 2^756721055 is an apocalyptic number.

756721055 is a deficient number, since it is larger than the sum of its proper divisors (159675745).

756721055 is a wasteful number, since it uses less digits than its factorization.

756721055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1388593.

The product of its (nonzero) digits is 73500, while the sum is 38.

The square root of 756721055 is about 27508.5633030880. The cubic root of 756721055 is about 911.2662222395.

The spelling of 756721055 in words is "seven hundred fifty-six million, seven hundred twenty-one thousand, fifty-five".