744318721 has 4 divisors (see below), whose sum is σ = 744375744. Its totient is φ = 744261700.

The previous prime is 744318703. The next prime is 744318779. The reversal of 744318721 is 127813447.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 744318721 - 2⁷ = 744318593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (744318121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1836 + ... + 38626.

It is an arithmetic number, because the mean of its divisors is an integer number (186093936).

Almost surely, 2^744318721 is an apocalyptic number.

It is an amenable number.

744318721 is a deficient number, since it is larger than the sum of its proper divisors (57023).

744318721 is a wasteful number, since it uses less digits than its factorization.

744318721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57022.

The product of its digits is 37632, while the sum is 37.

The square root of 744318721 is about 27282.2052077907. The cubic root of 744318721 is about 906.2603527569.

The spelling of 744318721 in words is "seven hundred forty-four million, three hundred eighteen thousand, seven hundred twenty-one".