755367721 has 8 divisors (see below), whose sum is σ = 764235720. Its totient is φ = 746548608.

The previous prime is 755367689. The next prime is 755367757. The reversal of 755367721 is 127763557.

It can be written as a sum of positive squares in 4 ways, for example, as 511664400 + 243703321 = 22620^2 + 15611^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 755367721 - 2⁵ = 755367689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (755367791) 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, 19335 + ... + 43411.

It is an arithmetic number, because the mean of its divisors is an integer number (95529465).

Almost surely, 2^755367721 is an apocalyptic number.

It is an amenable number.

755367721 is a deficient number, since it is larger than the sum of its proper divisors (8867999).

755367721 is a wasteful number, since it uses less digits than its factorization.

755367721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24443.

The product of its digits is 308700, while the sum is 43.

The square root of 755367721 is about 27483.9538822201. The cubic root of 755367721 is about 910.7226562529.

The spelling of 755367721 in words is "seven hundred fifty-five million, three hundred sixty-seven thousand, seven hundred twenty-one".