73407941721 has 9 divisors (see below), whose sum is σ = 106034867679. Its totient is φ = 48938085936.

The previous prime is 73407941683. The next prime is 73407941821. The reversal of 73407941721 is 12714970437.

The square root of 73407941721 is 270939.

It is a perfect power (a square), and thus also a powerful number.

73407941721 is a `hidden beast` number, since 73 + 407 + 9 + 4 + 172 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1625625 + 73406316096 = 1275^2 + 270936^2 .

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 73407941721 - 2⁹ = 73407941209 is a prime.

It is not an unprimeable number, because it can be changed into a prime (73407941821) 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 8 ways as a sum of consecutive naturals, for example, 767661 + ... + 857973.

Almost surely, 2^73407941721 is an apocalyptic number.

73407941721 is the 270939-th square number.

73407941721 is the 135470-th centered octagonal number.

It is an amenable number.

73407941721 is a deficient number, since it is larger than the sum of its proper divisors (32626925958).

73407941721 is an frugal number, since it uses more digits than its factorization.

73407941721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180632 (or 90316 counting only the distinct ones).

The product of its (nonzero) digits is 296352, while the sum is 45.

The spelling of 73407941721 in words is "seventy-three billion, four hundred seven million, nine hundred forty-one thousand, seven hundred twenty-one".