724831645 has 4 divisors (see below), whose sum is σ = 869797980. Its totient is φ = 579865312.

The previous prime is 724831643. The next prime is 724831649. The reversal of 724831645 is 546138427.

724831645 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 417670969 + 307160676 = 20437^2 + 17526^2 .

It is a cyclic number.

It is not a de Polignac number, because 724831645 - 2¹ = 724831643 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 724831598 and 724831607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (724831643) 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, 72483160 + ... + 72483169.

It is an arithmetic number, because the mean of its divisors is an integer number (217449495).

Almost surely, 2^724831645 is an apocalyptic number.

It is an amenable number.

724831645 is a deficient number, since it is larger than the sum of its proper divisors (144966335).

724831645 is a wasteful number, since it uses less digits than its factorization.

724831645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144966334.

The product of its digits is 161280, while the sum is 40.

The square root of 724831645 is about 26922.6975802946. The cubic root of 724831645 is about 898.2813476992.

The spelling of 724831645 in words is "seven hundred twenty-four million, eight hundred thirty-one thousand, six hundred forty-five".