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724740241 = 269212

724740241 has 3 divisors (see below), whose sum is σ = 724767163. Its totient is φ = 724713320.

The previous prime is 724740221. The next prime is 724740293. The reversal of 724740241 is 142047427.

Multipling 724740241 by its product of nonzero digits (12544), we get a square (9091141583104 = 30151522).

Adding to 724740241 its reverse (142047427), we get a palindrome (866787668).

The square root of 724740241 is 26921.

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

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 142047427 = 178355731.

It can be written as a sum of positive squares in only one way, i.e., 722050641 + 2689600 = 26871^2 + 1640^2 .

It is not a de Polignac number, because 724740241 - 219 = 724215953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (724740221) 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 2 ways as a sum of consecutive naturals, for example, 13461 + ... + 40381.

Almost surely, 2724740241 is an apocalyptic number.

724740241 is the 26921-st square number.

724740241 is the 13461-st centered octagonal number.

It is an amenable number.

724740241 is a deficient number, since it is larger than the sum of its proper divisors (26922).

724740241 is an frugal number, since it uses more digits than its factorization.

724740241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53842 (or 26921 counting only the distinct ones).

The product of its (nonzero) digits is 12544, while the sum is 31.

The cubic root of 724740241 is about 898.2435872250.

The spelling of 724740241 in words is "seven hundred twenty-four million, seven hundred forty thousand, two hundred forty-one".

Divisors: 1 26921 724740241