724567921 has 8 divisors (see below), whose sum is σ = 903357504. Its totient is φ = 564598320.

The previous prime is 724567903. The next prime is 724567969. The reversal of 724567921 is 129765427.

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

It is not a de Polignac number, because 724567921 - 2¹¹ = 724565873 is a prime.

It is not an unprimeable number, because it can be changed into a prime (724567721) 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 7 ways as a sum of consecutive naturals, for example, 4704910 + ... + 4705063.

It is an arithmetic number, because the mean of its divisors is an integer number (112919688).

Almost surely, 2^724567921 is an apocalyptic number.

It is an amenable number.

724567921 is a deficient number, since it is larger than the sum of its proper divisors (178789583).

724567921 is a wasteful number, since it uses less digits than its factorization.

724567921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9409991.

The product of its digits is 211680, while the sum is 43.

The square root of 724567921 is about 26917.7993342695. The cubic root of 724567921 is about 898.1723904037.

The spelling of 724567921 in words is "seven hundred twenty-four million, five hundred sixty-seven thousand, nine hundred twenty-one".